I am on child support for the next 14 years. I want to know if it's advisable to pay down a portion of my mortgage early if my parents want to gift me $40K or if I use my own savings?

I already know gifts cannot be considered income and does not impact child support.

I am more asking if it is wise to do actually pay down the mortgage or wait until I am no longer having to pay child support?

My ex is high-conflict and I have to give her my financials every year.

Anyone pay down their mortgage and end up regretting it?