Think bigger!We already do this with a couple of numbers. There's certainly the writing / arrangement facility in the band to do more, & that's one area we've decided to leverage, but again, time poor
There's both a musical satisfaction element for us, & an event satisfaction element. We're greedy, & want to tick both boxes. We're in the fortunate position of being able to select gigs. A few of them are very small stripped down Sunday afternoon affairs. We love a sprinkling of those, but we also like raucous large bar gigs, & of course, the bigger stage events. Our gig aim is to increase the number of bigger stage stuff, & decrease the smaller stuff, but not to extinction. The longer aim is to play more across the festival season, & less in the late autumn through early spring. The thinking being that leaves more concentrated time for rehearsal / musical development.
Arrange entire sets, not just one or two numbers. Hire an additional lead vocalist, or two, to lighten the physical demands (and cover absences if necessary). Most pro bands at the level you’re talking about have multiple vocalists, stage attire, and play medleys rather than individual songs. Songs are grouped loosely by genre, decade/era, and/or mashup potential. Playing to tracks is also the norm, since it demands a consistent performance, in addition to filling out the sound. More attention gets paid to choreography and blocking (i.e. where not stand or not stand).
You can also arrange your material in order to feature and spotlight individual players and moments: an 8 bar drum break/solo, a big guitar solo, an a cappella vocal break, a funky bass solo. There are ways to get more “musical”, in addition to just building a more exciting show. Take a page from the playbook of some of the great jam bands like the Allman Brothers.