improvement - Tactics vs Openings?

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Yaphank
I want to improve my chess. I’m 1400 rapid, 1200/1300 blitz. Should i focus more on tactics and puzzles for my training (2300 puzzles) or openings?

I know the London & Kings Gambit fairly well for my level, and i can defend most openings with black and enter the middle game even.

Is it worth it to learn more openings? Should i learn my openings deeper? Or will tactics get me to the next level? (I’m always training my endgame im unsure what skill level im at for that)