I think out of everything here, Avalanche probably has the most potential.
The Terra ecosystem is very interesting but I don't think that it's going to go anywhere in the long term, there are simply way better alternatives out there that are up and coming.
Polygon is a good short term scaling solution for ETH but at the end of the day the Layer 1 ETH network has to be scaled itself for Ethereum to succeed, so as soon as ETH2.0 rolls around I think that MATIC will take a big hit.
I think Luna is more better than Avax and very High potential like Terra Luna because they have their own Stable coin UST which is backed by Luna and most of Etherium Whales also holding UST which show that the future of Luna is bright. They are also constantly buying BTC in every Dip and I think thelis project can go big in Future.
I am not so sure about it, Luna is definitely something that is getting a lot more interest these days and I like the fact that the popularity keep climbing up even during a bad market period. However, I have to say that it is not going to be something that is sustainable if they keep this up, it is going to be a bit of a trouble for sure.
I just think that we are going to get something that would be a bit more on the risky side if they force their way into some high place. Avax is not like that, it actually does have a community that catapulted them here, unlike Luna which does have a community but at the size they should be at this level.