Hi doma,
Indeed, as I've mentioned frequently, the standard model is pursuing a theory of everything. But so far without success.
So one can suggest gravity is a form of electrostatic interaction. And then there is the problem of proving it.
At the moment, the evidence suggests it is not. Which is why I suggested you perform a simple experiment.
If electrostatic and gravitational forces are the same thing, then electrostatic forces should act in a similar fashion on all objects in the same way that gravity does.
But in fact they do not. Which is why, I suppose, you didn't give an account of your experiment. At the end of the day, it seems you cannot bridge the divide. Same as everyone else.
For me, that is because the universe isn't a singular space made up of singular forces. So I don't need to ignore the divisions between gravity and the electro-magnetic forces. They can exist in parallel. For me, the interesting mystery is the force which is the opposite of gravity. Which may be expressed in the form of the cosmological constant.