Struggling with progress, need your advice

I've been working out consistently for the past 6 months, but I feel like my progress has slowed down a lot. At first, I was seeing strength gains and muscle definition, but now everything feels stuck. My diet is decent, and I get enough protein, but I wonder if I should be changing my routine.

How do you guys break through plateaus? Do I need to lift heavier, change exercises, or take more rest? Would love to hear what worked for you.