I'm sensitive to toxic workplaces since I take my work very seriously, and it's a huge part of my identity, so my advice is more aggressive:
-Protection talisman to carry with me to prevent negativity and gossip. I would go to Mars, the Sun, Algol, or a demon. Pentacles of Solomon could be good here too.
-Curse the people making it toxic until they leave. Demons, angels, saints, gods, goddesses, anyone you're the most familiar with. I would go with Hekate. If you're okay with the instability it can cause in your life, you can also use the Curse of Set from PDM xiv. 675-94.
-Invoke angels of blessing for the company so it does better, and to ensure some power is guiding things in a positive direction as the negative influences are removed. There will be a power vacuum, best to fill it with good stuff. This also counters some of the spell-bleed effect from cursing. If you're not sure on who to pick, you can use Gilberto Strapazon's ritual for the Shemhamephorash angels which calls on all 72 for a single blessing.
-Frequent personal uncrossing & obstacle clearing work to cleanse off the negative energy that gets on you. When I was in a toxic workplace I would do this every other day, with a stronger version of it once a week. My preferred uncrossing ritual is Jason Miller's invocation of Jupiter from Financial Sorcery, where one single line when calling the 4 goddesses of the gates has an uncrossing. If I needed something more aggressive, I would pick PGM IV 1115 – 1226. If I still wanted to be even more aggressive and take on a longer form practice, I would take on a daily mantra practice of Simhamukha or Ganapati.