Being involved in crypto space for quite some time now, I have seen the price going up and down a numerous times.
I plan to try out trading to try my luck.

What I am looking forward to is if there are any exchanges that enable us to trade BTC/USD without the need to link a USD Bank account. I want to be able to keep my USD funds on the exchange itself (I am aware that it's not recommended to keep funds on exchange) and trade as normal. I would be just withdrawing the funds in crypto as the time comes.

Do enlighten me regarding this.

I don't want to trade between the cryptocurrencies because almost the entire crypto market follows the trend that Bitcoin takes on (more or less).