It is true that we are seeing many altcoins going down at a very high rate even in a short time period. At this point, the most important thing to do is doing a very good research. Because there are really small amount of altcoins which can be trusted for HODLing.
I think for now there is no need to do research which will waste a lot of time without a way out, because from the past until now the benchmark for the decline and increase in Altcoin prices is on Bitcoin, currently Bitcoin is experiencing a very severe decline, so all Altcoins are also following the current Bitcoin trend and you can prove my words when the Bitcoin market starts to recover and is normal, I am sure all Altcoins will also be normal and experience an increase in price.