When you say "Some with flash"
Was this the little pop-up flash that's on those cameras or a separate flash gun that's mounted to the hot-shoe?
If it's the first one, these exaggerate the small-light-source effect. You can't really bounce them, as they don't swivel. Although depending on where you are, I have seen someone jam a business card in front of one to bounce it up and off the ceiling.
https://www.cnet.com/culture/how-to-make-a-supersimple-bounce-flash-for-your-dslr/
One of the things that made the biggest difference to my 'party' shots was buying a proper flash gun.
You don't have to spend Canon money, I bought a
Yongnuo flash SH from here for less than £100 (might even have been £60-ish) and it's equivalent to the Canon Speedlight EL580/600.
They make a huge difference and the swivel head allows you to bounce it behind you and enlarge the light as discussed above.
(Not sure on current thinking, but it always used to be up and over your right shoulder. For some reason 135 degrees sticks in my head as the angle to aim at, but don't quote me on that).
What I'd say is that this technique works well in smaller rooms, in places like music venues that might have very high ceilings, I've never really mastered what to do with flash in those instances. As it's too far away to bounce it.
As for your pics, half the battle is getting them in focus, so a tick for that.
My criticism would be that they lack a little atmosphere - but I'd say that is a criticism of the party rather than the shots themselves.
There was a great YT video I watched that explained how you balance flash and ambient using shutter speed and aperture.
I don't use my flashes often enough to have mastered them, so feel free to ignore everything I've just typed - especially as I can't point to anything where I've got it right.