As with any investment, if people are that bullish it's usually a bad sign that it's at the top and needs a correction. I think the things keeping Bitcoin going is how scarce it is compared to the increased institutional demand (ETF's and corporate balance sheets) and the fact that Trump has promised a US Bitcoin reserve which will likely result in all industrialized nations doing the same. There's only so much Bitcoin to go around and if every country wants a reserve then there is all of a sudden going to be some insane supply shock where it's not crazy to think that it could go from 100k to 500k just as quickly as it went from 50k to 100k. It's going to be big money fomo'ing into the space in 2025.
I think the kids doing the silly meme coins is a get rich quick thing, which is different, and those never pan out. I feel pretty confident in Bitcoin itself currently. If you feel like you already missed the Bitcoin boat (I don't think you did) or want to diversify into other crypto - Ethereum is the silver to Bitcoin's gold, LTC and Solana will probably be next to get ETF's, Elon loves Doge coin, and banks love Ripple XRP as a replacement to wires. Everything else is purely speculation and everyone has their favorites. We'll see!