No one has mentioned shelter medicine yet. I'm sure someone else can talk about this more and it's maybe not as lucrative as other specialties BUT they definitely have surgical opportunities (beyond spay/neuter/mass removal). At least worth looking into working with a shelter vet eventually to practice surgical skills. I know a current shelter vet that coaches GP doctors on their surgical techniques.
Oh yeah, I'm in shelter med and the number of surgery junkies in this field is bottomless. There's obviously lots of HQHVSN (which can be fun in its own way), but absolutely tons of opportunities to do as many procedures as you're comfortable with (and have practiced enough to ethically do). I'd say amputations, enucleations, mass removals, fracture repairs, cystotomies, dentals, entropion surgery, wound management, +/- most GI/abdominal surgeries are fairly common depending on facility resources. I have several colleagues who also routinely do airway surgery, PUs, scrotal urethrostomies, and even TECA-BOs. There's quite a bit of CE and considerable personal time that went into those skillsets, obviously, but many folks are at places where tons of referral surgeries are a bit out of the question, but they're readily addressable problems and expensive enough to ask an adopter to do that they would present significant barriers to adoption, so lots of folks do what they can.
Pretty much the only part of the body nobody routinely gets into is the thorax, and that's because it's bad juju in there. And even with that being said, hell,
I've scrubbed in on massive diaphragmatic hernia repairs. And I ****ing hate surgery 💀
(and honestly, if you do TNR long enough, you'll do a few of your own. with all of those community cats with unknown histories, you're bound to run into incidental diaphragmatic hernias in the middle of spays eventually, which is a blast because you basically open their abdomen and they immediately lose negative pressure in their thorax and start to die and you're just like 😬🥲)
The other bonus of being a surgery junkie in shelter med is somebody always wants you at their shelter. Especially when you get nerds like me who would happily let you take every single surgery in the facility and I can take extremely tedious medical stuff off your hands.