How to slack off work,to prep for better opportunities

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I've been working 13+ hour days, but I don't feel like I'm making any real impact anymore, and the quality of my work has dropped. Every time one engagement is about to end, my manager assigns me to another without asking.

The work culture also feels off lately. People seem cold, and I just don't enjoy being there anymore.

The bigger issue is that I want to switch jobs, but work is taking up all my time and energy. I'm falling behind on interview prep and learning, which is frustrating because I used to learn much faster.

The thing is how do I skip my work,or do things which need minimum effort/time.

Domain: AI/ML

Yoe: 4