You know that altcoins are even riskier investments than Bitcoin. They fluctuate more and wider. And they have a much higher chance to drop to 0.
I don't say your portfolio is bad. I don't know. But if you are bitcoiner at hearth maybe you should have kept most of your money into Bitcoin.

Also, you know that huge amounts of money have gone out of crypto market. This clearly means that the altcoins have dropped too. A lot.
I don't want to "sell" you false promises. But in the same way we expect (sooner or later) money come back into Bitcoin, many expect the money back into the whole crypto market. And then some of the altcoins will recover not only against Dollar, against Bitcoin too. Just I can't tell which of the altcoins.

This is a quite bad time to sell, whatever crypto you sell, but also some altcoins may not recover at all. It's hard to decide which to keep and which to sell and it's solely your decision.