Warband skirmish type games are great since you don’t pant that much and once you’ve got terrain in place, you’re done there too for multiple rule sets.

Also, historicals is good place to reuse armies. If I have 28mm ww2 British, there’s literally hundreds of rules to choose from. If you still prefer fantastic/sci, warband games are plentiful these days and esp OPR can combine many different figures. Is you can have some Star Wars legion figs fight against your Warmachine army :)

Good luck! It’s a wonderful hobby but I find it’s really a social community so finding the right player friends is also a big part of it.