OP needs us to enlighten more about his request.
Sorry I should have been more clear, I'm not trying to make a single transaction from two addresses at once, I'm trying to redirect the UTXO of one of the addresses to my bech32 address, and then repeat the same process for my other address.
Are you sure the address starting with 3 is a segwit address?
If you have created that address using Electrum, that's not segwit. That's a legacy address.
I managed to create a segwit wallet by importing a random bip39 seed phrase, and then from the import screen select p2sh-segwit from the "Script type and Derivation path" screen.
But anyway, I was wondering if I purchase something using my legacy address, how to redirect the UTXO from that address to my bech32 address/wallet. Same with my p2sh-segwit address.