You shouldn't dwell on regrets, as what has happened is already in the past and cannot be changed. Instead, focus your attention more on Bitcoin than other crypto as many of them, as you mentioned are considered "shit coins." To be honest, Bitcoin is the dominant force in the market and the strongest crypto.
Focusing on Bitcoin alone can be a good way to avoid a lot of losses, but remember Bitcoin has high volatility but even so the returns and guarantees for Bitcoin will be better.
A Bitcoin drop is a good opportunity to buy and it all depends on the Bitcoin price.
Whereas other cryptos such as ETH, BNB, SOL, XRP are dependent on Bitcoin price and tend to be dumped when Bitcoin price is unstable like now.
Saying "damn coin" only applies to coins that do not have any development or will only be abandoned when the hype is over.
Many find Shitcoins that generate a lot of losses, so stay away from these shitcoins and focus on Bitcoin and the main altcoins.
I won't deny that I hold various other crypto on my CEX, but I don't often invest in them anymore. Lately, I've been primarily investing in Bitcoin and holding it for the long term.
If you are holding coins for the long term, I recommend not storing them in CEX, because the risk of loss will definitely occur and is more vulnerable.
Long term it is better to store in a private swallow with full control of the user, the important thing is to keep the wallet safe and that's enough.