Your valid signed tx expires - it's removed/purged from memory pool - only if it becomes invalid.

To become invalid, another tx with the same nonce should be mined, or the account should not have enough funds to pay for that tx.

To mine a tx replacing another tx with the same nonce, you need to increase the gas price.

There's no way to do exactly what you are asking for, that is paying lower gas fees for T2 or T3, but you can obtain a similar result.

Send a new tx that transfer all your fund to another account, use the same nonce of T1, and set a decent gas price (base fee is 39 Gwei now, ~1,40$ for a transfer, pretty honest). The tx will be mined, and your T2 and T3 will be purged because they cannot be satisfied anymore.

For completeness, there's another workaround (a more complex one, it depends on your social network ^^): contact a miner that is interested in inserting your replacing txs for 0 gas price, and get paid off-chain for the service.

If you don't need the original EOA to be preserved (i.e., you use it to be identified in some smart contracts, or some ÐApps, etc.), I think the first option is the easiest and fastest path to follow.

Your valid signed tx expires - it's removed/purged from the memory pool - only if it becomes invalid.

To become invalid, another tx with the same nonce should be mined, or the account should not have enough funds to pay for that tx.

To mine a tx replacing another tx with the same nonce, you need to increase the gas price.

There's no way to do exactly what you are asking for, that is, paying lower gas fees for T2 or T3, but you can obtain a similar result.

Send a new tx that transfer all your funds to another account, use the same nonce of T1, and set a decent gas price (base fee is 39 Gwei now, ~1,40$ for a transfer, pretty honest). The tx will be mined, and your T2 and T3 will be purged because they cannot be satisfied anymore.

For completeness, there's another workaround (a more complex one, it depends on your social network ^^): contact a miner that is interested in inserting your replacing txs for 0 gas price and get paid off-chain for the service.

If you don't need the original EOA to be preserved (i.e., you use it to be identified in some smart contracts, some ÐApps, etc.), I think the first option is the easiest and fastest path to follow.