Vouching for any exchange is like vouching putting your hopes on a ticking time bomb to never explode. In recent times, services within the cryptospace have been attacked once it got so big by the government. At other times, it could be as a result of the CEO trying to make profit off peoples money and this could as well go bad for everyone, other times it could be the result of hacks. Hence, vouching for the exchanges isn’t something you would find many doing but, a few of them could be suggested, how you use them is at your own risk and be sure to DYOR on them.

Personally, I can suggest that you try Binance, OKX and Coinbase.
Mind you, do not take excajhges for your wallet and store large some on them, it’s not advised and isn’t wise.