Quality project and the best team behind on this project, as Ethereum still don't solve their current problem which is high transaction fees, these kinds of alternatives chain will still grow and more useful.
There are still a few projects under Solana, a few months ago when Solana was still around $20-$40, pioneer projects especially DeFi was still growing and if you look at now, millions and billions for theirs TVL.
Hard to tell from the beginning, but since we are in a bull run, every coin that is solid will eventually reaches all time high, like BNB, ADA and others, and know SOL.
Perhaps that's what investors and projects are looking for, despite ETH upgrade, the problem still persists and I doubt that it will be fix in the future as obviously the price is getting high. Similar to bitcoin network, gets decongested every time it goes up.
For buying SOL, hard to say at this point, maybe it can still go up, but I'm not expecting another huge return of 100x in this bull run.