Id for sure open a real business. It can sustain you in all times and if you put in an extra effort it can bring you more money on the table. Can you say the same for investment in crypto?
Lets take an example where you decide to open a lawn mower business. You can put in as many hours as you want in the spring and summer time if your rates are attractive enough. Efficiently you yourself can decide how much money you will make. You will not have a lot of work during the winter but there you will be running your snow shoveling business. On top of that it looks good on a CV that you had your own little business.
Lets compare that to investment in crypto. Here you are at the mercy of the markets. Who is to say that we will ever have a bull market like we saw last year again? If not, then you really must beat the markets to make a sustainable income from investing in cryptocurrencies. Beating the markets for the average Joe is almost impossible at least in the long run. Sure, you might be lucky and hit one of those coin which multiplies your investment a thousand times but what is the likelihood of that?
I myself run a little IT company and I can write off some of the things I buy for crypto. I would very much recommend that 😉 Write articles, do SEO, become a webmaster etc. There are plenty of opportunities on the internet for running your own business.