"I spent $ 30 thousand, and in 6 months the return to me was $ 17 thousand." Bruh, you picked the wrong time to invest obviously. RIP your losses tho. It's something that's so unpredictable, investing in crypto is so dangerous, you have to be prepared to lose what you put in. If you had invested earlier or pulled out sooner you could have doubled or tripled your money, though hindsight is 20/20.
The riskier an investment is, the more you COULD profit from it.
"It never hurts to keep looking for sunshine" - A. A. Milne