Would it be possible to complete all of jojo in the first month which is like 140k
I was thinking of just fishing and planting a butload of cauliflower but would it be better to just wait for and and plant starfruit?
It's possible to do it in under three weeks if you just fish all the time. Day 2 you grab the bamboo pole from Willy and earn enough to buy the fiberglass rod and bait. From then onwards you can fish until 2am every day; rainy days in the forest river for catfish, sunny days at the mountain lake. And don't waste any time going home each night, just pass out by the water, with no money in your wallet
You'll reach fishing 10 at about day 7; make sure to choose Fisher and Angler professions to boost the sale price by 50%, and after that point you can sell fish and start to buy the membership and the repairs. Depending on the weather, and hence your access to catfish, you should be able to afford everything before day 20.
Because of their long growth time, and the dismal return on your energy investment, mixing in cauliflowers is only going to slow you down in a race for such a relatively small amount of money
Whether it's better to wait for starfruit is completely subjective: what you want from the game is up to you