This token is already two years old if its a gem of a coin it should have reached the top 100, there's still a lot of work to be done on this coin like marketing and building community and partnership, even if you have a use case and a working platform you have to be competitive in your marketing.
They have an existing announcement here in Bitcointalk but unfortunately, there's little update or activity.
[ANN][HTR] Hathor | DAG+Blockchain, PoW, TokenAccording to coinmarketcap, that crypto is at Rank #479 and I also did checked that they have launced their Mainnet on January 2020. After checking all that, I agree with what you have explained that if it is the next gem then it should have reached top 100. I also checked the price and during a day it dropped drastically and also increase which in my opinion it looks like a pump and dump situation happening during that time range