The real problem is that we just don't know what will be happening next to these cryptocurrencies you've mentioned here. Even Bitcoin of course, we just don't know when is going to be the next pump. In other words, there are uncertainties here.
But regardless, I just keep buying Bitcoin with my extra "not beer money" per month as long I can afford and not going all-in with my salary or life savings.
Now bitcoin is in much dip if you really buying bitcoin with your extra money then you should hold your bitcoin for long time. coz we know bitcoin will pump again and make new ATH like previous history . so Since it is your extra money you shouldn’t sell your btc early . just keep holding