Everything is very simple. Plant 10 apple trees. In a few years, you will receive 50 kg of apples per season from each apple tree. Total 500 kg of apples that you can sell to someone (or you can not spend money on food, but eat these apples). This is just an example. You can do this with anything.
And how much you will pay for tax in 10 years? What will be your cost for maintenance?
What if you don't have any land.
I don't find any ways to earn during crisis situation. You can apply for marketing jobs. But who will pay you in current situation?