What tip and tricks do people have to promote the role playing part of their games?
The old recommendation in all games about colourful descriptions, instead of only telling that a roll was a success or fail, have always worked well for me.
Deciding early what realism level I want to run with, so the flow and descriptions goes with that. But games to the realistic end of the spectrum are usually only at the "Hollywood realism" level.
And trying to find the right mix of calm periods and frantic action to fit the current group. Few things works as good of shaking someone out from meta thinking as an ambush, starting from the player point of view by a near miss. If modern weapons, a bullet hitting the wall, just centimeters from one of them, getting fragments of the wall hitting the face. Then not letting them think to much, and the opponents are acting while they try to plan.