Hey, I am wondering is it truly possible that my BTC works for me , without revealing my private keys and also without KYC ?
Letting your BTC work for you is possible but to just hold it and do nothing? I don't think that it will happen. In the end, BTC will help you give profit but you must exert some effort like trading maybe. With regards to no KYC, I don't know if there is some exchanges or platforms that supports BTC that also doesn't support KYC as well.
You can stake some altcoins with you having your keys with you but this will not possible for bitcoin.
I agree with this since there are many altcoins that are offering staking to their holders.
With regards to Bitcoin, there is no direct staking to it but there are some exchanges like Crypto.com and BlockFi that offers a small percentage of interest when you are holding Bitcoin into your account.