Hello. I have some amount of money that is invested in cryptocurrency. Specifically in Solana. And now I can't decide what to do with it? Sell it? Where's the best place to do it?

Have you seen Solana's course? You should see it before you give advice like that. The thing is that just last month Solana fell in value by a third. If this keeps up, you could lose all your savings. I would sell as soon as possible. Especially since it's not hard to do. Here you can exchange Solana to bank transfer: https://nimlab.eu/exchange/sol-solana-to-banktransfer-euro/ .