This is a hypothetical question but say we could control gravity what are y’all’s thoughts on how we could harness gravitational energy? Would we use it on its own or use it to enhance other types of renewable energy like tidal energy?

If energy conservation still holds (which seems pretty much an immutable thing in this universe) then being able to manipulate gravity would not help you with your energy production in any way. You would expend as much energy on gravity manipulation as you would ‘gain’ from your energy source (at least).