Grow more weird crops with the help of a shamrock or two (you can also breed them to make 16-leaf and up)
Grow more crops faster (adding water and light)
Grow more risky crops (iirc pumpkins sell for more but have a limited harvest window before they rot)
Fishing! …Just don’t go to a location too much or you will overfish. It’s like microwave popcorn lol—stop when you get fewer bites. Locations take 2-3 hours to reset
Complete all the wanted fish posters at the town hall
Complete all the photo quests on your phone. Double carrots if you take a pic of the shiny (starred) version
That is all the ways I have found in my months of playing
Eta the closest I could find from what I currently have to a laptop or typewriter is the cash register lol so that’s where Chi gets to write her novel.