I myself have made similar mistakes of FOMO and it just seems like everyone does, like it is an oath to becoming a good trader. So you have made the cardinal mistake of FOMOing (dw we all have) now you are in a spot of hodl or sell I would hodl myself because I don't like selling at losses. Also you have to look at whether those coins or not have a chance of getting out of the red and as far as I know those are okay coins and you should be able to creep out of losses. Lastly, know that I am still bag holding a couple of alts from last year some of which I have had for 10 months now (and don't know when I can get rid of but will wait it out).
I should have just went with bitcoin or ethereum. Cause if they go up then the other alt coins go up. They are the leaders of the pack it seems like. I will hodl since I don't want to sell at a loss. But you think they will go back up by the end of the year?
Experience is the best teacher as they say. At least you have learned your lesson and became wiser now when it comes to buying in this market. You are right don't sell them yet, it's not yet considered a loss unless you sell them at a lower price. The good thing here in cryptocurrency is the power of holding but it needs your patience. So my advice is, invest only the amount you do not need in the short term period.