One of my favorite historical geniuses was a man called Leonardo Da Vinci
Among the many gifts he left to humanity was this code of four principles to stimulate genius within yourself...
Study the science of art.
Study the art of science.
Develop all your senses especially your ability to see.
Study all the above in the light of the idea that everything connects, in
some way, to everything else.
What he was talking about with regard to the first two points is related to your belief that you are having problems with overthinking metaphysical topics.
Leonardo was talking about genius being neither being left-brained nor right-brained but a perfect blend of both.
Being left-brained when looking at right-brained subjects like spirituality is actually studying the science of art and I think you will actually gain considerable insights from having an analytical view of subjects that are not normally approached in this way.
What you appear to be concerned about though is that you feel out of balance with your left-brainedness. So perhaps from time-to-time, you might wish to come up with some ways for yourself to study the art of science.
Maybe you could engage in some artistic endeavors, play a musical instrument, get involved in amateur dramatics or improv, anything that allows that creative, intuitive element within you to come out and play for a while.
Sooner or later, you may start to feel a balance within yourself regarding your left and right brains and then this feeling of overthinking may subside.
Just a few random thoughts :)