I feel like I am about to get fired from my FT job at a major Bank. Luckily, I am mostly financially free due to smart investments over the years. However, if the axe comes, I would like to get my severance. I have been there for 7 years now. How do I play this?

I have been at this bank for a while. Today, I had a talk with my manager and he brought up “performance concerns”. Long story short, I have been working how I have been working the past 2-3 years , which is at a minimal rate. They want me to take more initiative but that is not going to happen. I am just being realistic about it. I rather they fire me but I want to make sure I have all my bases covered. If anyone with a similar position has experience, let me know. I am of 32 years of age and am a junior developer. Make about a $100K and I work in Ontario, Canada