Moving from top companies to chill ones?

I'm an SWE on a Skilled Worker visa with 2 YoE at a big tech company, plus top undergrad internships. I've been grinding since undergrad to get where I am now, but I realized that I'm absolutely burnt out and done with this shit. The pace and expectations are way too high, and honestly, the work itself is a struggle as the tasks are kinda difficult for me. I need to move to a company where the day-to-day demands are actually sustainable long-term. I'm not sure if corporate culture is for me anymore.

I'm currently in London making close to 6 figures, but I've done the math and I could live comfortably and still save on £45k minimum, ideally closer to £55k. Are there roles in London with a more relaxed culture that pay in this range and sponsor visas? I was thinking about the public sector but I'm not sure if it checks all these boxes.

I'm open to hearing any opinions, especially if you've made a similar move.