Unable to advance Island Sanctuary

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Date & Time: */18/2023 0252
Frequency: ongoing problem since July
World name: Balmung
Character name: Flashman Foxx
Retainer name: n/a
NPC name: Pathological Pathfinder Mk.VI
Monster name: n/a
Class/Level: Dancer /90
Party or solo: solo
In-game time: ongoing problem
Area and coordinates: X15.1 Y30.3 Z0.8
Housing: Island Sanctuary
Steps:
1. Have done all offered Island Sanctuary quests up until this Quest
2. Island Sanctuary is now level 14. This problem has been persistent since the Pathological Pathfinder Mk.VI first appeared back when my Island hit level 11.
3. I understand that NPCs are supposed to visit your Island (per a friend who has a level 14 Island). I have never had any NPCs visit my Island and have had no quests offered to have them visit.
4. Pathological Pathfinder Mk.VI quest marker is red. It has been red since he first appeared and as of this writing is still red.
5. I did all offered quests to advance my Island as they came available and had made all the tools and leveled all the buildings to level 3.I have my landmarks all placed. These were finished by level 8 and I just then worked to cap my Island level which at the time was level 10.
6. I cannot access the cave, which cuts me off from resources I need to make the tool to advance the quest. There is also NO point of interest to investigate for the cave.
7. I would really like to get this fixed as the Island Sanctuary is for me currently broken. Any help would be greatly appreciated. Thank you:)
*Add more steps if necessary

Connection Specs
- Type of internet connection/provider: Ethernet/Cox
- Modem maker/model number: Arris SB6190

■ PC Specs -=-=-=-=-=-=- System Information -=-=-=-=-=-=-

SYSTEM_OS Windows 10 Home 64-bit (6.2, Build 9200) (19041.vb_release.191206-1406)
SYSTEM_CPU AMD Ryzen 7 3700X 8-Core Processor (8 CPUs), ~3.6GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 8 SYSTEM_CORE_PHYSICS 4
SYSTEM_BIOS 2.4.1
SYSTEM_LANGUAGE English (Regional Setting: English)
SYSTEM_MEMORY 16310.453MB
SYSTEM_VIRTUAL_MEMORY 134217727.875MB
SYSTEM_PAGE_FILE 18742.453MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 222.163GB SYSTEM_FREEDISC_SPACE 39.158GB
SYSTEM_STORAGE D:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1862.891GB SYSTEM_FREEDISC_SPACE 789.920GB
SYSTEM_DIRECTX_VERSION DirectX 12
SYSTEM_GRAPHICS NVIDIA GeForce RTX 2060 SUPER
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP NVIDIA GeForce RTX 2060 SUPER
SYSTEM_GRAPHICS_MAKER NVIDIA
SYSTEM_GRAPHICS_VRAM 8019.000 MB
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SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 3840 x 2160 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_ad96858edfdf0915\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_ad96858edfdf0915\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_ad96858edfdf0915\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_ad96858edfdf0915\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 31.00.0015.2824
SYSTEM_GRAPHICS_DRIVER_DATE 1/14/2023 19:00:00
SYSTEM_GRAPHICS_DRIVER_LANGUAGE English
3.0
SYSTEM_GRAPHICS_PIXEL_SHADER 3.0
SYSTEM_GRAPHICS_VERTEX_TEXTURE SYSTEM_SUPPORT
SYSTEM_SOUND Headset Earphone (HyperX Virtual Surround Sound)
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SYSTEM_SOUND_DRIVER_VERSION 10.0.19041.3208
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SYSTEM_SOUND_DRIVER_DATE 7/5/2023 19:00:00
SYSTEM_SOUND Realtek Digital Output (2- Realtek(R) Audio)
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SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.0.9394.1
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 8/8/2022 19:00:00
SYSTEM_SOUND SONY TV *00 (NVIDIA High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {2E21FA95-1233-4908-8E3D-057336189C9B}
SYSTEM_SOUND_DEVICE_NAME nvhda64v.sys
SYSTEM_SOUND_DRIVER_VERSION 1.3.39.16
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 1/14/2023 19:00:00
SYSTEM_SOUND Speakers (Steam Streaming Microphone)
SYSTEM_SOUND_DEVICE_ID {B25247B3-E0D5-498E-9121-48C971805C58}
SYSTEM_SOUND_DEVICE_NAME SteamStreamingMicrophone.sys
SYSTEM_SOUND_DRIVER_VERSION 8.33.15.17
SYSTEM_SOUND_DRIVER_LANGUAGE
SYSTEM_SOUND_DRIVER_DATE 7/27/2017 19:00:00
SYSTEM_SOUND Speakers (Steam Streaming Speakers)
SYSTEM_SOUND_DEVICE_ID {60A4575D-10B4-4D49-90F4-A9DFD1418C1C}
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SYSTEM_SOUND_DRIVER_VERSION 17.56.13.764
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SYSTEM_INPUT {6F1D2B60-D5A0-11CF-BFC7444553540000}
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SYSTEM_INPUT {6F1D2B61-D5A0-11CF-BFC7444553540000}
SYSTEM_INPUT_NAME Keyboard
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It is common that when you built your last landmarks, you didn't later go and click all of them to watch the cutscene that shows they were completed. This is required for the next quests to show. I had this issue myself and it has solved it for others who have posted a bug report here.

Also need to build any new tools if you haven't.

Check every building and landmark on your island. Chances are that one of them isn't considered finished.

You'll get some good chunks of EXP from the various stage completion rewards, so it might not take long at all to get through the last part of the upgrade process from here.

Thank you both:)
I will try these things:)

Oh Yes !!! Thank you, Thank you:) I had not clicked on the Lighthouse and seen it's cutscene. Now that I have the quests are opening up and Im doing a happy dance:)
Have a great day and again, Thank you:)