How long would you wait for a partners libido to increase

Like the title states how long would you wait for your partners libido to increase , I’ve been with my gf for about 9 years the first 3 were very sexually active and overall as fulfilling as one could hope for. The last 4-5 have been brutal I’ve only received oral once in the passed 2 years and it wasn’t long lived. She swears she still finds me attractive and blames it on our life changes

Admittedly it’s been pretty hard the past few years with big moves , she wants children and I genuinely haven’t had sex more frequently than once a month and only during ovulation windows for close to 2 years