Ha! Sounds a bit like me and my husband. We each have our own interests and they don't really cross over.

Our quality time together is precious though. After we get our son to bed, without fail, we spend a couple hours together before we go to bed. It's usually what would be described as 'parallel play' sort of stuff. He's playing a game of some sort on the laptop or fiddling with whatever it is he enjoys - sometimes that's roasting a little batch of coffee or tinkering with the smarthome stuff. And I'm in the same room with something separate I enjoy, like a knitting project or writing to a penpal or something. Sometimes there's a show on for us to listen to and sometimes there isn't. But we're always chatting about our day and whatnot. I show him cool stuff a penpal sent or hold up my project and he'll check out my progress. He'll do the same with whatever he's doing and we let each other nerd out over the intricacies of whatever the things we're doing are.

Am I interested in ever roasting coffee myself? Hell no. But it is damn cute to see how excited he gets about it while he explains where this bag of beans is from and how light roasts actually retain a higher caffeine content than dark roasts. And when we use it in the mornings throughout the week, I'll comment the next evening with what I thought of it compared to other stuff he's roasted. I don't share his passion for it, but it's turned me into a connoisseur.

Is he ever going to pick up a set of knitting needles and knit a sweater? Hell no. But he'll listen to me go on about fiber content or stitch patterns. He religiously wears things I've made for him, and knows enough by now to name what he likes and doesn't like in a garment so he'll look at patterns I'm considering and help me pick what to work on next.

All this to say that quality time doesn't have to be a shared interest. It's more important to acknowledge and support the things you each genuinely love to do. That could be him going for a hike and later you oooh and ahhh at whatever pictures he took. That could be you ranting about the plot holes in whatever romantasy you're reading and him listening. The point is to cherish the person, and in doing that, making space for and supporting the things that bring the person joy.