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What I don't understand on your statement is on how are you going to enjoy your money if you will not withdraw it to your bank account?
I don't need it in fiat for the time being. So I thought maybe I can just trade and increase my current stack of coins.
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I highly recommend coinbase pro:
https://pro.coinbase.com/marketsThey have a license to operate and their headquarters is in San Francisco California so quite safe to trade fiat to BTC. I believe bitfinex offer BTC/USD trading too but keep away on that exchange since they have a lawsuit against them.
You can check your state on the below link if coinbase has a licensed to operate in your place.
See here:
https://www.coinbase.com/legal/licensesThanks for this information, but I am not a US citizen so don't think I can use it...
Pretty much all exchanges won't require you to have a USD Bank account, and it's just that you will withdraw your profits in BTC instead of USD. I doubt you'll find an exchange that could give USD without a bank account, that's just not right. Check
https://coinmarketcap.com/rankings/exchanges/ for the rankings with adjusted volume. Choose any of the ones there and probably use BTC as a deposit and withdrawal.
FYI, you already answered your question. Just use crypto and you don't need a bank account. What's the point?
I would be just withdrawing the funds in crypto as the time comes.
Let me clarify my question, I want to trade my coins for USD and vice-versa but I don't plan to withdraw my USD to bank.
For example, say the price of bitcoin reaches $10k so I would sell some and keep the USD in the exchange, and say when the dip happens and the price goes to $8k I plan to buy back the coins using USD stored on exchange and withdraw them back to my wallet.