In my opinion there is no one cryptocurrency that can be the next Bitcoin, because Bitcoin will forever be the king of cryptocurrency and remain top 1, so I still choose Bitcoin, even though EGLD is very good, it still won't be the next Bitcoin and will probably only be top 10 (beating ADA and SOL), but there is no harm in investing and holding EGLD for the long term, because you can still get a lot of profit from investing in EGLD.
Why do you think Bitcoin will remain top 1 crypto? Is this just because Bitcoin is a first-mover? Assume, just assume today Bitcoin becomes legal tender of let's say Brazil. You know what happens? Tx fees will be so high so that even buying a car will be a problem. And that's not gonna change anytime soon. Lightning network seems to be out of favor and there are no other scaling solutions. It might take years to decades for new scaling options to be developed, tested, and deployed. Why would you want to wait all that time if we already have blockchain network that can process 1m+ tps and also has easy to use mobile app that is perfect for mass adoption?