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.