…weirdly, I think I’m always bolder with tempo changes when mixing live, not keen on doing too much of it on a recorded mix (unless its deliberately chill/downtempo).
Like Hannu says, big changes are tough when mixing…. if you have an ‘end-goal’ tempo-wise, you need to bring it up very gradually over quite a few tracks. I’d also say, don’t be afraid to just do the odd crossfade, you don’t HAVE to beat-mix every track…. something with a nice whooshy intro/outro, preferably in-key, can make for a cool direction change.