Hi I won 7 figures on soccer betting over the last few months and withdrew the crypto to my cold wallet, how can I sell this crypto and avoid paying taxes?
7 figures is not a small amount that you can hide from a tax agency, either you need to be extremely rich to cover up the winnings while reporting the income or don't report the income at all.
First of all, this isn't avoiding, it's evading.
If you moved the rewards to a non-custodial wallet that isn't connected with any of your KYCed addresses then you can use decentralized p2p exchanges like BISQ to convert crypto to your fiat in smaller amounts.