BTC Only don’t touch alts
There is nothing wrong in altcoins. Why shouldn't you invest in them? in 2020-2021 you could generate a huge profit by investing money in Matic polygon and it was not a shit memecoin, it was a valid coin. BNB was a good option too because that halving was the time of rise for Binance as a trading platform. There are many details that you have to consider because it's not 2016 today when you could 100x your capital in some months via holding bitcoin only.
I am also one of those that finds investing in altcoin more profitable than Bitcoin but it is packaged with higher risk. There are many decent altcoin where we can choose to invest. Not all altcoins are shitcoins as some of the members here think. Bitcoin is good if we want to minimize our risk and look for a higher gain than traditional investments. I agree that in Bitcoin, in order to get 100x we need to wait for a decade or more while 100x in altcoin can possibly happen in just weeks or months if we are lucky but if not we might lose all our investment. That is the risk of investing in altcoins.
Investing in both is the best approach, IMO. The funds can be divided according to the person's likings.