Bitcoin should be the priority. But it is no problem to invest in altcoins as well. Altcoins also have good potential profits if we know well the characteristics of altcoins. We must know the best time to buy and sell the altcoins. And we don't be greedy to set a target for taking profits. In the current market condition, you must know that Bitcoin price is also unstable. It is actually not so different with those altcoins.
For me, BTC is also highly volatile: +2000% then a 75% drop is something we've seen in the previous cycle. The only thing that sets BTC apart from ALTs is that we can almost count on a new ATH for BTC price in the new cycle.
I love BTC but I'm not giving up on ALTs either. Unfortunately, I don't have the market timing skills to optimize my investment in this market. It would be great if we could buy and sell BTC & ALTs at the right time to capitalize on BTC recovery, followed by ALTs explosion. Even now, no one is sure if altseason will happen this year, investors have the opportunity to accumulate ALTs at low prices like in the crypto winter but they seem to be refusing.