What you should have done first is to withdraw that funds from Coinbase to another exchange if you must trade with it or to your private wallet where you have full control of the money. The reason for this is because you claimed that your wallet have been compromised, so it is risky to keep the money there because the scammer may remember you again and then come for the balance that he left there.
I know there used to be good youtube channels, but if you do a search its just "here is how to set up your email to get coinbase!"
You can use your available email for registering an account at Coinbase easily, but later steps are more difficult.
Coinbase exchange is KYC so if you are not US citizens, you will have problems with KYC there.
Lastly, I want to share something that you need to know about Coinbase, its expensive withdrawal fee.
Problems with Coinbase Withdrawal Fees.I think the OP does not have a problem accessing the account neither is the problem with the withdrawal feel. The problem I see there is the trading fee which he said is eating up his profits from trading which is what he is doing with the money left by the hacker who hacked his account.
I am curious why OP couldn't just trade using FBTC or IBIT or one of the other ETFs in a no fee brokerage account. Sure there is a spread, but it might be better than the fees on coinbase. Likewise if it is in an IRA type account, then the taxes wouldn't be an issue.
So, if he has BTC at coinbase, sell it, fund an IRA, move the cash to that brokerage, then trade there.