For low-budget investments, I recommend entering low-risk coins. You should keep a close watch on BNB and there. I can say that you will not be upset if you buy at the right time.
That is right top altcoins investment is riskless and if you don't want to take a huge risk, you should invest in BNB, XRP, ETH. They have more potential than others, but it is more necessary to choose the right time for investing in any project. As you mentioned above, we have to buy the coin at the right time if we don't want to be upset. Overall there are a lot of currencies and some of them are really successful, however, you should spend enough time to find them.