How do I increase my bank account limit?

My bank account currently has a limit of $3,000 per day and I want to increase this. On the Coinbase website, it just says "Increase your bank transfer limits by increasing your volume of crypto purchases while ensuring your Coinbase account is verified and remains secured". I have been making a lot more purchases lately but my limit is still the same. I was told it could be based on how much money is actually in your bank account but I know people who keep less money in their accounts and somehow have 15k daily limits. Has anyone else had this same issue? Is there a way to increase this? I prefer to buy crypto with my bank account because the transaction fees are way cheaper than other payment methods.