It’s because of the bear market. If you aren’t familiar with this term, then you will find a tons of topics regarding this in the entire forum.
This also brings an opportunity for many crypto investors to invest in the coin, as they are getting it in very cheap price comparing to the original prices.
So if the the market is down for months, then no need to panic about it. Once the market again gains it pace, it will skyrocket like anything. Just be patient and wait for the right time.