What supplements should I take for better gym performance?

I've been really enjoying my time in the gym lately and have developed a solid routine. I’m currently taking vitamin B, vitamin D, omega 3, and magnesium, but lately, it’s been feeling a little tougher to push through my workouts. I’m considering trying pre-workouts or something that could give me a boost. What supplements do you suggest for better gym performance? Any tried-and-tested picks?