I do think you need marriage counselling.
To be blunt, I have a lot of faith in the infinity of the male sex drive (for most men), so for you not to want to have sex with her you have either got a very low sex drive (do you?), or your wife - with whom you presumably USED to want lots of sex with - has changed in some way. She's started thinking Nigel Farage is actually a hugely insightful modern thinker, or she has physically changed significantly, or maybe - and this is the most likely - since having two children, one of whom has extra needs, you have less fun together and you don't associate her with having a brilliant time the way you used to.
Has she been largely at home with them over lockdown?
How is her career right now?
Do you think she is happy?
What about her tiredness levels?
Is she feeling overwhelmed or exhausted?
Is she depressed about how her career has stalled since having the children and then lockdown?
Does she feel that she does the lion's share of the emotional labour of having a child with extra needs?
All of these things make her less "exciting" to live with, make her less likely to to be as physically fit (I don't mean thin) as she probably was 9 years ago, make her conversation less sparkling than it was that night in that bar in Thailand on your first holiday together.... but each and every one of those things is something that you have the power to help with if you ask her what she needs.
If she is happy, professionally and emotionaly fulfilled and rested and knows you have her back, and gets to do lots of non-child things with you, you have every chance of getting your marriage back on track, and fancying the knickers off her every day.
I have a strong traditional streak in me, and the idea of getting divorced just because you don't think your wife is as sexy as you used to is dreadful to me. You're at a tricky and tiring point in your marriage. You need to work at it.