If you believe in Bitcoin you can sell and buy Bitcoin. The price of Bitcoin has also risen quite rapidly recently. I think the future of BNB is not bad, it is one in my planned portfolio, I will always choose it for now, and it does bring me profits.
In my opinion it would be nice to convert BNB into bitcoin, it doesn't have to be all you can determine the percentage to convert to bitcoin and some remain to be BNB. Bnb is one of the coins that I also have, but I think you should also own bitcoin, especially if you intend to hold it for the long term, I highly recommend it. Most people are now almost flocking to own bitcoin, they are doing various strategies to own it, and the popular strategy now is DCA.
That's my advice with coins you should hold on to, so do your best.