Work on own startup vs switch to another startup

I've 3 yoe, currently working in a very small startup as full-stack dev. Company's revenue is declining from Q4 last year.

Every month layoffs are happening in each team. Last week, a dev was laid off from my team.

No hike till now, working here from last 1.5 years. Although, got performance bonus twice.

I want to work on a few ideas, tried to work on weekends but it led to burn out and started affecting my health, suffered from mental fatigue.

Please suggest.