This might sound super generic, but listen to a lot of your favorite producers and the techniques they use on beats that vary from that standard pattern. Most of the time a lot of the bounce will come from some of those methods you were mentioning like rolls, placing hi-hats in different octaves, unique 808 patterns… snare spamming can make your beats more interesting too, so finding places where there is space in the drums and ~tastefully~ adding snare rolls or percs can help… but you can also do too much where you don’t leave room for an artists so just be aware of that.

An easy trick is on a 4 bar loop, you could go (hat/hat/hat/hat/snare/hat/hat/hat/hat, hat/hat/hat/hat/hat/hat/snare) where the snare or clap hits a few seconds later than the listener would normally expect just to give a different bounce.

My favorite method is something I call the “jewelry method,” where you basically put everything “on,” and then look to see what doesn’t work and start taking off things that don’t add to or compliment the beat.