How to grow the bitcoin you have without being involved in gambling or putting it in a custody wallet for APY. Is there any proven low risk method.
There's no other way but to accumulate bitcoin put it in a wallet that you have control over the private keys or mnemonic phrase and that's it.
No single formula to grow your bitcoin, you really need money to invest on it.
The only other way I know is to join bitcoin paying signature campaigns and hold the payment.