Should I convert my coins into BTC and ETH?

I have a lot of altcoins that lost most of their value, is it worth to get all back to BTC and ETH or should I wait they regain some of the value? Bought some before the crash and started buying the dip after, but only did this to the main coins, most are down like 90%.
Coins like ADA, DOT, BNB, NANO...Also some minor ones
I know some of them have potential, but it is just harder to manage many coins and BTC is safer in case of another crash. But feels bad to exchange a coin that fell 90% while BTC is down like 70%.