Your transaction fee is low, I'm not sure if in the last 3 month transaction fees has drop below 20sats/Vbytes. You just constructed the transaction without checking anything, seem you didn't even follow the reconmmed wallet fees, no wallet should give you such fee recommendations judging by your wallet addresses, sending from multi Sig to a legacy address will require more fees.
You have two options. The first is wait for extra 6 days and your transaction night be drop from the mempool but this is not guarantee, there are instances like this that transaction were stuck more than 2 months and didn't drop. If you use a wallet that enable transaction to drop from mempool by default, it should drop after the 6 days.
The second option is if you have access to the private keys of that receiving wallet address, do child pay for parents transaction, spend the incoming output as new input and you will have to spend for the pending transaction and the new transaction provided that you have the private key to the receiving address.