Tips for dealing with a toxic workplace?

I have been at my current job for a little over a year (it's my first job after finishing my masters degree), and especially within the last few months, there has been a huge turnover in staff building wide, resulting in significant staffing shortage. I work, as a speech-language pathologist, at a specialized school for students with Autism, which is a tough environment, for sure. The staff turnover and shortage is attributed to significant challenges with administration/supervisors not addressing presented concerns, no matter how much people complain and advocate for change, extremely low salaries with raises almost never provided, etc. Although my coworkers within my department are very helpful, most of the staff at my workplace have become very burned out, and it has made the general vibe of the workplace to become very toxic and negative. I really empathize with many of the staff I work with, and try to help and support my other coworkers as much as possible, as well as trying not to take any of the negativity from interactions very personally either, but it has definitely been a challenge, and starting to impact my self-esteem, and my life outside of work because I constantly feel like I am always focusing on my workplace, even when I'm not there, and all of the stress I feel from it. I have been looking for new jobs; however, full-time jobs for my occupation are very competitive within my area, which makes it difficult to leave, and I am trying really hard not to quit without securing another job (4 weeks notice is required when leaving a job). I understand that no workplace is "perfect", and have worked/interned in some other workplace settings that were not truly optimal either, but my current workplace has been the most severe I've seen. Does anyone have any advice about how to cope with working in a toxic workplace?

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