I am not really popular with TradeUp.net exchange market and recently have used Binance, OKX and Coinbase but my priority exchange for trading is Binance. You can trade or using OKX as exchange for trading because have many altcoins listing there if you not use Binance as most popular exchange have billion user until right now. My recommended you can trade cryptocurrency assets with Binance, OKX, Kraken exchange because have many option altcoin for trading, if you interested with Coinbase you can't trade many kinds of altcoin but that exchange very trusted and friendly for users.
One important thing during all exchange have support P2P right now, you must find exchange have many community for P2P transaction in your country, I used Binance because easily for selling stable assets by P2P if not use local exchange to withdraw cryptocurrency assets to Bank. Just remember, all your recommended exchange must verifying document ID for available trading, withdrawing and depositing fund.