so here my monthly salary is about 3,500 Cuban pesos, which is equivalent to 12 dollars approximately, therefore I would like someone to please advise me on a page where I could work without investments
Cuba has been a place I have always wanted to visit, don't ask me why...
But a simple Google search on Cuba's minimum wage shows that it's currently around 2100 Cuban pesos and you are almost at 2X the rate which makes you better than most.
Btw I don't know how you got to $12 but
3500 cuban pesos shows that it's equivalent to ~145 dollars and that $2 per day from faucets isn't needed...unless am missing something or its 350 Cuban pesos you meant.