Because I see a lot of people asking and wondering about certain things but other people that have had rank 10 just seem to talk about the bike...
Nothing seems to have upgrade options so far. You can fly on the island though, which means you can complete the map. Flying also lets you get to a couple of nice gatherering locations, not that it matters. One spot is really good for Islewort and Cotton Bolls, although the main spot for Cotton Bolls was already good to begin with. The other spot atop the mountain is good for Quartz(the best place for it actually). Feels weird to get these after there's nothing left to build improve upon. Your granaries can sustain your workshop(and themselves with a surplus of 50 cowries per expedition if you sell off the 4 rare materials.
There's also the obvious motorcycle that everyone is mentioning(that I'm mentioning again because we can't seem to mention this thing enough).
I guess at this point it goes from a daily to a weekly. At this point it can be really casual. I can load up the granary for the week, set the workshop up for multiple sessions.
- I could come back daily to gatherer from my animals, but I don't really care about those.
- I could also come back every two days to gather from my garden. I could casually do this by buying the seeds for 2 cowries each knowing that the rare seed produce sells for 6 each(and you receive 5 produce per seed). This would eliminate the need for you to rely on your granary or to gather seeds yourself.
- I could also make sure to return every week to gather 100 mats and to check my workshop after it's made 20 items for 1,000 blue cowries each(these are weekly challenges that reset).
The weeklies and the gardening are likely what I'll focus on doing, since between those and the surplus profit you make from selling off the rare materials, you should make 4,660 blue cowries a week. This doesn't include your workshop's profits.
I personally don't feel like creating a spreadsheet for my workshop so I simply set it to cheap items that build up groove that can easily be maintained by my expeditions. I'll try to leave my workshop clear and see what I get for a week at some point. This seems to be the most casual way to handle it.