Building off of what Lew said, generally if you're at the stage where you need perfection money you're on ginger island, in which case the mainland farming is generally not worth your time. You should just try to plant as much starfruit/ancient fruit on the island and work on processing it all. Dehydrators are a great bet in 1.6 as they're low cost but still more than double crop value when you have artisan.
Other methods include mining for iridium in skull cavern (which can make a lot but is largely skill based), farming radioactive ore to sell as bars (can make many 100,000s per day but is pretty soul crushingly boring and does require some skill - also just not worth it on non pc platforms), pig barns for truffles, sheep barns for cloth (makes a decent amount when optimized as is very hands off once set up), or optimized fishing (caldera fishing then smoking lava eels can net a couple 100,000g per day when done right but it's not great if you aren't a fan of fishing. When you get the extended family quest you can get so much per day off of legend 2s), a giant honey farm on the island (some people just like harvesting machines rather than crops), etc.
There are other methods but generally most people do what's simple and fast. You don't need to crazy optimize your money as overall perfection doesn't demand an absurd amount of money. I'd say starfruit and dehydrators is absolutely fine so long as you get it started when you get to the island and keep it up as you pursue other facets of perfection.
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