First and foremost I would say that the TRON blockchain in itself is the most overlooked project of them all. Apart from it, there was MATIC (polygon) which came into light only recently.
Other than these, i am not able to see any others. But i am damn sure that i have probably overlooked the others too

Yes, but you also need to know that mastering all of them is a very difficult thing for anyone, because it is still better to focus on just a few and then produce, than having to master all of them which sometimes makes someone overwhelmed by it.