Banning refueling would be a big mistake, I like the variation in performance you get because cars are on different fuel loads. Surely not refueling, there fore possibly less pitstops (depending on tyres) is only just going to take away even more overtaking.
It would enhance overtaking, drivers would have to take more risks, and the cars would have to be designed in such a way that made overtaking as 'easily' as possible. 'Overtaking' in the pit lane as we've had for the past few years is dull tbh.