Depending on the amount of Bitcoins you possess, you may want to try OTC trade, Localbitcoins (according to some previous posters going out of business soon), debit cards by Binance, Coinbase, Wirex etc (limited amounts). You could also try to find someone locally (can be dangerous).
To use these cards, you have to do KYC, and if you do that, you are always exposed to the risk that your data will be shared with your tax institutions - because they can always legally request such data, and if I remember correctly, the IRS requested and received such data from Coinbase in the past. Even if you use so-called
"anonymous cards" and pay for something online or in physical stores, you can be located via IP address or you will be recorded by one of the surveillance cameras that are everywhere.
Of course, in the case of small amounts, there is no need to worry too much, because the resources of government agencies are still focused on some more serious tax violations.