Earlier quoted context omitted.
If you're open to it, I'd recommend trying the Wim Hof technique. The combination of controlled hyperventilation followed by cold water exposure is something like a reset button. Here's a link [0] - just don't do the breathing exercises anywhere that passing out could cause problems; like when driving, in water, etc. 0 - https://www.youtube.com/watch?v=tybOi4hjZFQ
Thanks for sharing! Controlling my breathing helps me a lot to reduce anxiety, but I found it's not getting me back into motivation mood I used to have.. To stay motivated always seemed to be such basic thing- part of my reality, until it stopped and I have to consciously build it.
Consider that perhaps being motivated automatically isn't always the best thing. Auto-motivation can make it harder to choose a good and worthwhile direction, which motivates you on its own merits to something above self-interest.
Maybe you could afford to let your self-motivation lie fallow for a while, if that's what you need to do. Put your brain in a jar, and do something helpful and physical.
Maybe none of this applies to your situation? I do find it an interesting topic as well though.