I have to close it for fiscal reasons and I can have a very negative impact due to Blockchain behavior.
I have a wallet with 1 Stellar XLM and Blockchain doesn't allow me neither to sell it, to send it nor to close the wallet.
Can someone help me?
AFAIK, they have an exchange and most exchanges have minimum amount to sell/buy. 1 XLM is just worth $0.11. Do you think that it will be allowed easily by that platform?
I don't think so because you lack from the probable minimum amount of exchanging that they have. The best that you can is not to think about it anymore and forget them with your account.