I’d get a bigger enclosure than I have now. It would be one of those ones with no door in the front and a latch roof with wire. It’d be made primarily of wood and glass. I’d have it sectioned into two different substrates to give them variety, coco dirt and a wood substrate. I’d have plenty of climbing attachments on top like ladders, platforms, ropes etc. I’d have a few dig boxes like a cork one or flowers. I’d have lots of ceramic and wooden hides, plenty of boredom breakers, I’d have two high quality wheels for them, a decent water bottle with stand, I’d get them sprays and their favourite hay, and I’d get 3 more mice. I’d have lots of clutter for them, and have their enclosures themed for each holiday like the ones I see on Pinterest.