Holding this coin is the good idea but final decision is yours only.
I have around 34 BNB in my exchange wallet now. It is around 700 USD now. Even you may make the profit for sure.
Id rather hold that 34 BNB rather than selling it at the cheap price, as far as i know, BNB is a good investment, compared to other coins out there.
Maybe you can buy more BNB if you think that the price can increase in the future. And I see that BNB was down in this day so I think you have your chance to buy BNB at a low price. But be careful because sometimes, you will see that after you buy, the price does not increase instantly and even the price will get down for a while and then it started to increase. That will makes you got a little panic but don't worry because it's normal to see that thing in the market.