I think for day trading btc is the best option. Cause it's too risk for altcoin in short time trade. And i think XRP is the valuable choice on of you are holding. RVN and ADA also good altcoin but i re-commanded XRP. Day trade really risky but if you want here some alt which i think good for day trade. that is only my opinion- btc, nano, xrp, bnb, lsk, dgb you can try on those coin.