Sign a new transaction with higher fee, or CPFP (Child pays for parent) to the rescue from the receiving wallet.
When Ordinals NTFs and BRC-20 tokens were created, the transaction fee rate increased to over 300 to 500 sat/vbyte. I saw purging around that time to be over 32 sat/vbyte. That means transactions that pay lower than that would have been dropped from mempool and replaced by higher fee transactions. Making a transaction using a fee rate lower than 32 sat/byte at the time too will be rejected by nodes.
In case such transaction was broadcasted and not rejected but the fee is not enough.
If RBF is enabled, which is enabled by default on what that supports it, RBF can just be used to pump the fee instead of CPFP to take advantage of lower fee.