Trek actively gave opportunities to its actors in the TNG-VOY era to learn and try directing. The number of Main Cast actors who've got directing credits is pretty significant. The full list, along with the episodes they directed, is here: https://memory-alpha.fandom.com/wiki/Cast_members_who_directed
Of the TNG cast though, Jonathan Frakes, Levar Burton, Gates McFadden and Patrick Stewart all have at least one director's credit in the series. Michael Dorn would also later do some DS9 and ENT episodes.
