Help with Level 6 rune knight feat
So I am playing in my first DND campaign as a rune knight. I am a sword and shield user more of a frontliner for our party. We just got a level up last night and now I get to chose a feat but I have no idea what to pick. I was leaning towards Sentinel but is that really worth it without Pole arm master? Is there something else I should be looking at? For context I use the fire rune and cloud rune.
Since a couple people have asked my feats and stats are below :)
Feats: dueling, skill expert(athletics perception strength),ability score on strength and constitution
Strength: 19
Con: 16
Ac 18
My play style is frontliner somewhat control with the cloud and fire rune. Goal is to be the front line battle field controller