Actually it's true that many projects are moving to BSC, but there are different categories of projects there; first are those which starts on BSC in which only few are trustworthy to invest in such as CAKE. Second are those which are moving from different blockchains like Ethereum, Tron to BSC, in this case, only few are actually moving to BSC with a genuine reason and others are doing so just drive hype and pump their price.
Therefore, it is good to know a good deal about the token you want to buy and how long it will probably last so that, you don't jump into one whose team are just looking for a way to cash out.
On that note, good BSC projects for 2021 which I can suggest are CAKE and BAKE.