There are many theories that unify the forces. I heard somewhere that there are in the neighborhood of 1000 unification theories. None have been accepted by experts. IMO the main obstacle is the assumption in GR that curved spacetime is the underlying mechanism that causes gravity, because the associated math leads to very accurate and useful predictions that have been confirmed by countless experiments over 100 years. The SM has been similarly confirmed. Something has to give.
IMO, gravity results from quantum mechanical interactions, just like every other force. The assumption of curved spacetime is incorrect. While the math is an excellent approximation, a different underlying mechanism is at work.
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