There are some coins, at their early stage in the crypto market, that are popular because of the hype given. But as time passes(years), they become less popular, making people forget them.
I think that's the case of Babydoge. So many investors have forgotten that it still exists. If you didn't mention it now, I wouldn't have known that it still exists as one of the memecoin.
Thousands of coins exist in the crypto space. For any coin to stay relevant in the crypto market, it needs marketing and a strong team to keep updating its community about the development of its project.