Your marriage is over. She has completely checked out.
At age 5 & 7, you should all be having a family dinner together at the table each evening. Discussing your day etc. Children should be able to put themselves to bed (mostly), and then you and your wife should have an adult evening together, with sex at least once a week.
She seems to be hiding from you. Why? Did you have an affair or something?
Why is she a SAHM when the kids are now in school? If you are loaded fine of course.
I'm going to tell you how our evenings go, as a benchmark. We have one "child" at home just now, aged 20. She is home from Uni for the summer. I work from home.
DH gets home from work at 5.30pm. I make him a cup of tea & ask about his day. He asks about mine.
7pm-8pm Me, DH and DD sit at the table for at least one hour having dinner, talking and enjoying a glass of wine or two
8pm Me, DH and DD pick something to watch on TV, last night it was Black Mirror and Love Island. We frequently pause this to chat though! TV goes off about 10.30pm and we chat for an hour before bed.
At least once a week, daughters boyfriend will join us for dinner. We spend about 1.5 hours chatting at the table, and after this we tend to play games together.
Anyway, I digress somewhat. What are you going to do? And why the fuck are you only having sex 4 time a year?????????