I’d get rid of any cutesy/comedy moments involving the Ewoks.
The problem with, that, though, is that you’re attempting to portray the Ewoks as an actual threat if you take out anything that makes them seem otherwise, but they at their core are meant to be cute
They can still be cute but removing some of the more silly moments won’t hurt them or the film.
Edit out the shot of Wicket knocking himself out with the bolas and shorten the moment an Ewok steals a speeder bike. I’d end the scene just as the biker scouts begin their pursuit. Dump the footage of the Ewok trying to control the bike.