$ 600 for 1 altcoin is of course still very profitable than $ 600 just to buy Bitcoin,
therefore your choice to buy altcoins is the right one, I have a good recommendation that you can hold until the bull run returns or maybe hold until 2024 or 2025,
that is the Origin Protocol, yes one of the altcoin projects that is still off the radar and still very undervalued, buy and hold OGN I'm sure you will get a lot of profit.
In the last bullrun it was a very good project for profit. It was one of the first projects on Coinlist, if I am not mistaken. There is one uncertainty in all this, because the coin is already quite old, it is more than 5 years old, if you count since the ICO, it is not sure that it will update its ATH, or will grow at all. You can take a risk, but I wouldn't put all the money into this altcoin. I would recommend OP to add at least one coin that entered the market last year, or this year. The younger the coin, the more likely it is to make a good profit.