Asking for suggestions about what altcoins to buy is not the best for you because anything that happen afterwards you'll be the one responsible for it so its better you do your own research about the available altcoins on the market and select the ones you think are good for you to invest in
It is true that it is better to do your own research about the coins you are going to buy because, as is well known, the nature of coins is unpredictable and has advantages and disadvantages of each.
Asking for advice is a good thing but we must have our own commitment and of course before we start investing in Crypto first to understand the risks and benefits.