It is recommended that you choose good coins like btc, Eth, BnB, comp, that already have a value and focus on the market, no new coins or memes if you invest every month

I'm new to this. I saw my investment drop from $53 to $43 within a week, and it’s discouraging. I was considering investing 10-20% of my salary into crypto each month, but now I’m second-guessing. Should I still invest? Is it safe to hold crypto for the long term, like 1-2 years? Also, could you recommend some coins that are relatively safe for long-term holding?