It is possible to exchange your crypto to fiat in Elegro wallet. Never seen such service before. Amazing! The process is quick and easy. It is a pleasure to use this wallet for any purposes.
If you need it in Ukraine, there is one near me - Hotel "Ukraine" in Mykolaiv,
Prospect Centralnyi 73. With it you can buy and sell BTC, BCH, ETH, DASH, LTC, ZEC, XMR and DOGE. Try it out!
Investing in Bitcoin is profitable, I think. At least, because in the next few years the course will definitely grow, and there is a high probability that it will be an order of magnitude. The issue of coins is limited, soon the mining will become a thing of the past. The future is in cryptocurrency...
I think fiat money will exist for a very long time. However, in the next few years, their priority will decrease by several times, compared to the cryptocurrency.
Check the channel "World Crypto Network" on YouTube. A lot of useful information. Both theoretical and practical examples. At one time it helped a lot to understand the cryptocurrency at all.