A habit I find my mind practicing incredibly often is simulation of the worst case scenario. [...]

I'm not saying this is generally inadvisable, but it seems dangerous for some kinds of people because of a serious possible failure mode: by focussing on the half-plausible worst-case scenario, you will cause yourself to assign additional probability to them. Furthermore, they will come true sometimes, which will give you a feeling that you were right to imagine them, an impression of confirmation, which could lead to a problematic spiral. If you have any inclination towards social anxiety, practice with extreme caution!