I feel generally devastated in life, and I don't know how to take back control.

A few months ago, I saw my dad get killed by unidentified gunmen in front of my house, in front of me and my siblings. Ever since that point, I've found it hard to do anything. I can't summon the discipline to work out, find a job, or even do general chores.

I've spent 4 years internalizing TRP principles, and I have those principles to thank for the things I achieved before the quarantine hit. But that one event shook me to the core, and I find it hard to realign myself. What steps do I take?