I think altcoins will bounce back again. It just needs patience and time. Nevertheless, you can buy bitcoin for now and hold it for sometime. With the altcoin, I'll advise you to wait until altcoin season begins then you can start buying altcoins too.
If to buy I don't think it's necessary to wait for the season to come, because when you have the desire to hold for the long term, then buying before the season is the right time. So to buy it is not necessary to become a FOMO, make a buying before the season because at this time you can buy at a low price.