Polkadot looks like a blockchain that can compete with ether. Gavin Wood has been working with Ether for a long time so the polka can be considered his version of Ether 2.0.
After BSC, I think Polkadot is indeed a worthy project to compete with ETH. not to mention there are polygons and Solona that are getting a lot of adoption.
maybe another one that is not as popular as RSK. it's been a long time, but its development is not getting mass adoption like ethereum and BSC.