Alternate cosy weekends with out and about weekends. Or for a long time I had a three week rota of cosy weekend, DIY/gardening weekends and museum
/cafe/cinema nights to weekends.
Reserve the right to vary that schedule in bad weather.
Films, home made snacks, blanket dens, crafts and generally chilling out on the cosy weekends. Summer version can be tent, paddling pool, making frozen yoghurt and picnics.
DIY weekends can be spring cleaning, building flat packs, wandering around B&Q, making mood boards. Let them get involved in things as soon as they're old enough. They can help with painting (emulsion anyway) and housework quite young. Also let them make some of the more minor decisions about by to plant in the garden, the colour scheme for their rooms and the bathroom etc. Over a whole childhood they will learn skills for adult life that way. And it's valid family time. You are all a family, taking care of your home together is self care and increasingly will be a group responsibility. Plus it's fun. Mine remember laughing while stripping wallpaper and things like that and those memories come up as often as holidays and so on.
When you are out about, walk as much as possible to get exercise and tire them out so they sleep well and you can unwind at night.
Try and get some fresh air and exercise with them every week day, be that walking, collecting conkers, swimming lesson, taking the dog out or 20 minutes in the room after dinner.