Congratulations ! Maybe its even more a reason for that since you got it the hard way, as a leisure flyer and completely on your own dime ^
Do you have a plan how to skip the MM mark?
If not flying (and for this flight I would make sure I´m in F)
then I would spend the miles difference on a dinner or something special !
Do you want to have this moment that took you 13 years pass away while paying at WalMart?