What should I do?

I’ve been with my partner for almost 9 years & we have been married for a year and a half. I am running my own carpentry business while she is a stay at home mum. I’m working a very physically demanding job every day sometimes I need to do some late nights/weekends to meet project deadlines. I bring in a very healthy income of between £6-8k monthly which is plenty for us to live a good life in Scotland. I start my days work at 9am so in the morning I will get up and help her by making kids breakfast, make her a coffee, do any dishes that need done, occasionally get one of our kids dressed for nursery just small things to be of help. If I’m home from work early in summer I will play in garden with kids & get them bathed & help with kids nighttime routine. My partner is always on my back that I don’t do enough around the house and that she feels like she brings the most to the table in our marriage & that I don’t contribute nearly enough often saying things like “bringing in the money is all you do, that’s not enough” After a days work work my energy is low but I still try and do these small things like baths ect to help out. We are still only 30 and our sex life is pretty much non existent. Over the last year and a half it’s been 1 time per month if I’m lucky, it can often go a couple of months with nothing, I try very often but she always refuses (I know 100% she’s not talking to anyone else or cheating so that isn’t even on the table) I’m not a big headed person but I am a good looking guy, I used to get told by a lot of girls in the past and even still today. I have been 100% faithful from start till now with my current partner even though the physical side of our relationship is non existent. She drinks more often over the past few years sometimes having a bottle of wine multiple weeknights, where as I rarely drink. I love my kids more than anything & at this moment they are all that matter to me. If I end things it’s going to cause a lot of disruption in their lives (this happened to me when I was younger & it wasn’t nice). My kids are the reason I want to go out and do so well for my family but it’s getting harder when I don’t feel I’m getting the respect & appreciation from my partner for what I’m doing, It’s making me care for her less & less & id love to just walk out but I need to consider all options as my kids are the most important people in my life and the last thing I want to do is hurt them or cause any disruption to their lives.