Greetings Adventurer and thank you for posting in the Final Fantasy XIV Technical Support Forums!

I'm really sorry to hear that you're experiencing crashing issues despite having tried a lot of troubleshooting from your end already. I would also recommend the following troubleshooting, as it might help with alleviating the crashes:

1. Please ensure your OS is up to date. Please be sure to install any optional updates as well (these are not applied automatically; you so may need to initiate them manually).
2. Disable all programs/overlays that you may have running in the background (Nvidia Geforce Experience, Steam overlay, Discord overlay, etc.)
3. Make sure your anti-virus software has the appropriate exceptions for FINAL FANTASY XIV.

I do hope these steps help!