If you have large capital to invest in crypto, then you should pay attention to a good platform and have a guarantee that you will be able to benefit if you invest in it and your money will be safe using the platform, for example USDT or stablecoin.
USDT or other stablecoins are only for maintaining asset value or are more suitable for asset security, while for profit I think it is still not suitable because Stablecoin price movements never shift in large numbers like other coins on the cryptocurrency exchange.