Investing in projects such as pre-sale process or certain other sales before the launch on CEX exchanges, stakes from sites for directly transferred coins and campaigns on forums of various kinds are literally a very good option in the crypto world, even with a small amount in the wallet.
For small amounts of money, this is not a problem, maybe just being curious about the development of related projects is normal. The risk, which is quite high, is indeed not appropriate to be used as the main investment vehicle in the world of cryptocurrency. 1% - 5% of our total free money is of course a reasonable amount to buy coins during the sales period.
To be even more convincing, I recommend investing in projects that are already running and have good progress. The risk is lower than a new project, but sometimes it still has the possibility of providing high gains in the future.