(.....)
And also can we see another top project in the rank of 1 to 20 failed like that of Luna?
Big YES. This is already proven over time. We cannot say it is failed but it is slowly going to fail or be replaced by other quality projects or new projects. For example forked of Bitcoin, like Bitcoin cash, Bitcoin SV, and many more. At first they are on top, full of hype, pumps and dumps everywhere but after that, they are slowly going down.
indeed! there are many old projects that were previously in the top 10 or 20 but they are now sliding down their position. as quality projects are rising up, those crappy ones and with no solid use case will go down their ranking. as you mentioned, the hype before with forked coins were great, but later on, people still go back to the original btc, hence, slowly dying the hype surrounding the forked btc.