When you can see, most popular coins disappeared and most of them make you feel awkward situation, then definitely bitcoin is smartest choice among them. Bitcoin also decreased so many tome but it only disappointed them who sold off cause even after crushing market on 2017, bitcoin gives 2-3x roi which is big achievement who trust bitcoin and as you said, bitcoin will recovery in long term, so there is nothing to worry but hold tightly.
Thousands of alts have been abandoned and exited in this market, and yet, bitcoin is still maintaining its top position. It is more than a decade that no coin or token has replaced bitcoin, and I think, no alt will ever replaced its position for the next 5 years or so. This is why if you are a beginner in this market, better explore the bitcoin market first and then, just go with other alts once you are equipped with knowledge that may aid you in making a mistake with alt investments.