I still have a lot of Altcoins left in 2018 and I haven't decided to sell it. Because I also still suffered heavy losses. But this is at my risk when holding lots of coins. I will sell it when the market has gone up and now I'm sure the market will come back up again.
The current BTC price is gradually recovering and stable above $ 5k3. This is a good sign for you to hold altcoin now. The market is showing signs of good recovery, no longer facing the bear market. I think you should hold on because the BTC price may increase to $ 8000 in Q3 this year.