Feels like my skills are worsening.

In roughly 3 weeks after getting back into chess, I jumped 900 to 1260, showing great progress in my understanding of the game. So I've started studying more and when I expected to improve further, it feels like I've just gotten worse.

I had a 58% win rate on rapid this week and now it's 52%, I'm currently at 5 losses in a row and 1196 elo. I'm starting to get frustrated at the game, and it isn't fun. I'm unsure if I'm struggling to digest the concepts I've been studying, but my mind feels significantly more cloudy during games.

Are breaks advisable if this kinda thing happens?

I've been studying the Vienna and Scandinavian Defense, but mostly focusing on middle and endgame tactics. I've studied roughly 3-4 hours daily the last 3 days.

Sometimes the concepts genuinely help, and I'll be winning, but I've been making mistakes and even blundering more often.

I'd greatly appreciate anyone's opinion on any of this, thank you for your time.