adding on to this, don't upgrade your items above Rare, this is because the arena heavily depends on the rarity of the items you have on your mech, so building your mech like this ensures a comfortable r1 every season
Also make sure to buy more tokens with dad's credit card and spend it on buying all of the token mechs from shop (they have super op hidden unique items what can get you to rank 1).
use 50 percent of the tokens you buy on coins, max out your base, and spend the rest of your coins on power kits, do not wait either, pay the token fee to skip the wait time. You do not have time for broke people shit anymore. (Alternative route. Daddy's Money Route Unlocked) lmao. If this route is taken, Doki will tell you what to do next
If you are an unemployed parasite with no income monthly or generationally. You have to farm. It's time to grind the campaign. Use your absolutely busted 3 element powerhouse of a mech and take down everything up to silent waters. Then go back and do everything again in hard mode. Use your rewards from missions and leveling up to upgrade your essentials, and keep your tokens as a refill on fuel incase you run out. Do not be afraid to use most or all. As tokens are easy to obtain.