Well, we all have different opinions and expactations from crypto.
From my dexperience, when bitcoin grows alt coins grows even faster but when the bitcoin fall altcoin falls even faster.
I had some funds before invested in alt coins but I decided to move everything in bitcoin in order to preserve the value of my portfolio.
This is answer based on my experience.
Then, an alternative decision can be taken. You can exchange half of the altcoins that seem to be not as profitable as you would like to see them to BTC, and the other half will be in Bitcoin.