But preferably, take a look first at top alts as you can't easily be liquidated from these projects.
There are a lot of alts to buy, but if you have no time to do your own research, better stick to BTC or other top ones.
BNB is quite good, but should be update with the news surrounding it, but compared to most alts, it has the potential to increase in the coming years.
However investing in BNB is a really bad idea if investors are not following closely any news related to it, since June the price of BNB has gone down 20%, and it is possible this tendency may continue as the SEC will keep going against binance for the foreseeable future.