OP, just Buy and HODL. There's not actually a need to "buy" then "sell". That requires that you out-trade the thousands of counter-parties in the market who are faster, smarter, richer, and who are better traders than you.
Denominate most of your capital in Bitcoin, zoom out, lower your time preference, and invest LONG TERM. Because 90% probability you might not outperform Bitcoin.
Buying is easy, but holding is very difficult with most people in this young market. With this market, fud can harm newbies a lot and with high volatility, people can easily feel panic and lose control very quickly in mass FUD days.
To be strong, people need to have deep knowledge about this market, how it works, how it survives well through fud and previous bear markets, and they also have to secure their bitcoin by themselves in non custodial wallets. Another thing is don't use leverage or futures trading, because when they use leverage or futures in trading, emotion will appear more intensively than with Spot trading or with investment, pluses liquidation risk from exchanges.
Holding your bitcoin is key to succeed and get profit in this market.