Right now, the best Altcoins to buy are ETH and MATIC (Polygon) on the top of my list, since these are the coins that have very good technology backing and use cases, which will make them highly used coins in the crypto environment. Further, UNI and ADA that also fulfill the same criteria. There might be other altcoins too that maybe be great, but these are the ones that are in my radar.

Whenever you target to buy some cryptocurrency, aim for those that promise to deliver value to the users of such currency and have actual use cases. Further, given that governments are cracking down on various cryptocurrencies, it is very important to choose currencies that are genuine and not just shitcoins/memecoins.