Binance is the best place to convert such big amount without KYC because other p2p platforms will have liquidity issues which may take too longer for the trades to get completed.
Which you planned to buy with bitcoin? Better consider alternatives of USDT like DAI which are truly decentralized.
Well, Binance isn't anonymous nor is it fully KYC-free, at sums as large as almost 8,000,000$, I am quite sure they
will request identity verification to proceed with the withdrawal.
OP, your best bet is Bisq if you really want anonymity and privacy. Exchanges keep your IP and fingerprint besides deposit/withdrawal addresses.