There's a discord/reddit post every week that outright gives you the best results for the schedule every day. So if you want to be lazy and basically get free materia via cowries, that's how to do it.
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They moved to discord just because it's easier but they also post on reddit. Here's the link.
I found most of the experience of building up the island to be enjoyable. Now I'm in "mostly automatic" mode. I follow the recommendations on the Island Sanctuary Reddit page - I only check animals/crops once/week. I rotate my granaries once per week. I haven't had to harvest anything since my second week. I'm in it now to get those achievements (cowries, crops, granaries, pasture). Whenever I get to 500k and finish those other achievements, I'll probably stop.
I'm treating cowries like MGP. Easy to build them up now and if they ever add anything, I'll have the cowries to buy whatever comes out.
The number of very seriously replies to this obvious joke post is alarming...
It's an easy way to get the rare dyes and all it takes is 15 minutes on Fridays to set everything up. Hopefully they don't change the currency next patch.
My poor mammets probably have no idea what to do. Went to the island once and never went back. Hopefully they swam back to the mainland or something.