I used to go all-in on crypto too, but I've dialed it back a bit. Right now, I keep about 60% of my assets in crypto, with 40% in BTC.
In my opinion the biggest and most popular cryptocurrency is bitcoin then there is ethereum in the market other known crypto currencies are tether, dogecoin, cardano, XRP, binancecoin. At the moment every token in the crypto market is going up and down in price so you should buy coins that are at the very top. Also you should pay big investment on eth.
What you said is certainly true, that until now the best and most promising cryptocurrency with the smallest risk is bitcoin, so it's no wonder that many people invest in it.
After that, of course, there are altcoins such as ethereum, BNB, SOL, TON etc., which are definitely the best ranked on CMC, because their reputation is undoubted, because they can survive until now.
In the past few months, there has indeed been a continuous decline and increase because the movement of bitcoin has not reached its peak, which is expected to occur in 2025.