I keep it simple. White walls are easy to spot paint and very bright and airy, which means I can use low lighting and colourful accessories which are easy to change.
I stay on top of manky things, like keeping mould away and stripping sealant and replacing it. I don't let small jobs go past 2 weeks (currently need to replace a hob light, under counter light and bath plug washer which are this weekends job). If I can't do it, i pay someone and where possible rely on word of mouth. Do you have a local town Facebook page?
I'm also always decluttering. I don't buy more bookshelves or wardrobe storage, I get rid of stuff to fit the space. Then the organising looks tidy which makes me happy.
I'm also on a massive bender for using what I have before letting myself buy new stuff, whether that's a new kind of tea, craft supplies, books etc. It's hard!
My advice on DIY is don't wait for a man. Once you start on the DIY, you realise how easy it is and can usually do a better job than them anyway and if not, it lights a fire under their arses to see you doing it while they are left to do childcare. And if you do fuck it up, you can pay someone to fix it.
It's also quite frustrating to realise how long culturally men have been riding the gravy train of doing less chores because they do the DIY, but I digress!