I received a payment of roughly 5500 bytes but the sender only used a fee of 5 sat/byte so it has been sitting unconfirmed for almost 3 days. Is there a way to pay someone to seek out this tx and include it in a block?
You may be able to simply cancel it and resend it.
Bitcoin core includes a command "abandontransaction", but I've never used it and don't know the requirements.