A very nice cabinet. Much too nice to discard.
I actually prefer a TV to sit high, but if you can't use it in the house, maybe you can put it to good use in your garage for storage.
If you attempt to cut it down to lower the height, you will be getting into a very major project. I'm not saying it can't be done. But I don't know your ability for such a major redo.
If you don't have time to do it right the first time, when will you have time to do it over?