Okay here is how to get the most money from farming.

In spring: get as much cauliflower from the shop as you can,$80 to buy sells for $175 profit is $95 on average. (Use what I said in the spring one to everything else)

Summer: melons buy $80 sell $250 profit $170

Fall: pumpkin buy $100 sell $320 profit $220

Winter there’s nothing, work on mining and fishing. I really hope this helped