It seems to me that in today's market conditions, it is best to buy Ethereum and BNB. Binance coin is very popular at the moment, I think it will see good growth in the near future.
I was worried about the duration of his/her investment (long term or short term) until I saw your comment then I realised that these are really good good. Whichever duration you choose, you won't really go flat because both coins have strong developmental structure and active team which remain the strongest stakeholders in cryptocurrency market