Have you tried things like:
Tickling your amygdala forward: as I understand, this will eventually activate supercomputer frontal lobes instead of reptile part of the brain; will “turn on your brain’s built-in genius problem solving, creativity, and intelligence circuits”. I think I read somewhere that heart is connected to frontal lobes, but cannot find this info now. Instructions here: https://neilslade.com/
Moving consciousness* onto the heart: don’t know - can you move your consciousness onto one arm, so that you feel energy there, while not in the other arm? If so - have you tried to move this onto the heart and stay that way for some time?
* not sure if this will be correct word
update:
Coherent Breathing: technique of breathing smoothly and in constant manner (like 4 seconds in, 6 seconds out; or whatever, just constant). Additionally - breath with chest, not belly, to massage the heart and activate it. Details here: https://www.youtube.com/watch?v=0xc3XdOiGGI