I agree with you, if you want to invest safely, rather than having to bother choosing lots of coins by doing research, you can buy bitcoin when the price of bitcoin is still low and hold it for the long term. For altcoin choices, we can buy ethereum, BNB and Solana
If we want to invest in a safe way, we must avoid to invest in too many coins. We must invest in few coins only, just choose the most recommended coins. Just ignore the random coins because the chance of a lose is too high in this type of coins. We also need to focus on old coins only because they have been proven for safe coins. ETH, BNB, SOL, MATIC, DOT, TRX, XLM, BNB, ADA, and HBAR are the examples of trusted coins.