Bnb has gained much potential that the reason now it become so trustworthy and can be bought from anywhere if you are aiming to hold it for long. Waiting for dip isn’t always makes you more profitable but disappointed too cause its hard to determine the actual time. So don't buy at onve. Its wise divided fund into three, buy bnb and if dip occurred, then buy Again or if it pump due to upcoming good news then buy again with rest of fund. Avarage you’ll be in profit IMHO
In terms of buying, everyone already has their own strategy and method at a certain time, although the way you say is not bad to apply, but if you want to buy BNB for now it is always good even without having to wait for a deeper decline because BNB will not continue to decline for even lower prices unless the market corrects by a very large percentage.
Currently, BNB, which has lost value with the effect of investors moving away from BNB, is open to investment. It is at the most reasonable levels you can get BNB in 2021. This opportunity will be worth considering.