Is it possible to get the trading fee discount after signing up without a referral code?

Unfortunately I didn't sign up using a referral link, which I now regret as I expect to buy crypto regularly, and the % saved on fess adds up in the long run.

My question is if there's any way that I can get that trading fee discount after I have already signed up? I guess there is the option of deleting my account, but I have already bought some crypto, so in that case I would have to move them somewhere else and then move them back, which I don't want to due to withdrawal fees.

If not I guess I will have to move to Kraken or some other exchange...