1. Go to your Etherscan profile pending transactions.
2. Go to the lowest (longest ago) one.
3. See the "Nonce" number assigned to it.
4. Go to https://app.mycrypto.com/send with Metamask or your wallet provider.
5. Send yourself 0 Eth with 750+ Gwei and the SAME nonce as step 3.
6. That transaction will get cancelled. Repeat the same until no more pending transactions.

Bonus reminder: Set your transaction deadline to 3 minutes or less on Uniswap during times like these.

https://t.me/WolfCryptoAnnounce/4313