I know one name which is EOS. When this coin was launched many said that this project would be an ethereum killer. but today we see EOS is not even one of the choices of the project developers. I see no one is using their network. and the price of EOS has fallen greatly. maybe these coins have lost 90% since their last ATH. in 2018-2019 eos is still in the top 10 largest marketcap. but right now EOS is way below.
In this case, I think the problem is due to too many expectations on EOS at the moment. I personally still rate this as one of the top projects, and it will take time to implement more things on the ecosystem. Maybe it's not suitable for the current trends, but in the long term, I still find a lot of potential in this ecosystem.