Investing in Bitcoin is a pretty risky business, so you should only use a relatively small amount of capital that you can afford to lose entirely if things go badly. But these high risks could also come with high rewards.
You can still make money from mining coins, from buying and holding them, or from trading them on the financial markets.
mining coins is not in anyway risk free. Nor is it the best investment opportunity. Just because you're investing Bitcoin doesn't mean you need to invest in Bitcoin mining.
there was a time where mining altcoin was the best investment you can ever do, and without risk basically, you just need to instamine a good amount at launch and dump to one sucker on the thread of that alt
then repeat, it was one of the most profitable way, and the good part of it, is that it was possible with 1 gpu only, i think it's still possible, but to a much lower extent