1 - Just trade with bitcoin - usdt or bitcoin - USD or Bitcoin - another good stablecoin
2 - don't day trade with altcoin, don't do that.
3 - study a lot of technical analysis and don't trade with a 15-minute chart, try to trade with a longer time chart. Bitcoin is more profitable if one buys low and sells high and doesn't catch small fluctuations, it doesn't generate profit in the long run.
example:
wait to fall to 19000$, buy and put Stop - loss at 17000$, when it goes up to 22000$, put stop - loss at 21500$ and only sell at 24800$ if there is a bearish reversal signal, if it breaks 24800$ then put stop-loss at 24800$.
do not do it:
bitcoin is at 23000$, buy and when the price reaches 23400$, sell and wait for it to drop to 23000$ and buy to sell at 23400$, this small fluctuation will not make a profit in the long run