Bin VAR altogether - number 1. It was a bad idea that's been terribly implemented. Thrown at the top levels of the game without even been trialed properly to see if it works.
Goal-line tech - keep.
Offsides. Simply the offside rule and look at using automated technology when it's there IF it can make the decision more instantaneously. If the goal today is ruled out more straight away (as goal-line tech is, or the lino's flag is) then so be it. But not after a goal has been celebrated.
Off-the-ball incidents - allow refs to look at on a screen, if drawn attention to something by the 4th official.
Penalty decisions - the ref makes the call and that's that
So, taking the latter one - what happens when the ref *doesn't see* what happens, like even slightly. Take the Man City Chelsea penalty controversy - where Grealish clearly moves his hand to block the ball in the wall. The ref *clearly* didn't see what happened (as he gave it as a goal kick, so he didn't see any contact) - why wouldn't you want VAR, in that situation, to exist - and to then tell the ref "look mate, you clearly didn't see Grealish handle the ball - can you go over to the screen to watch the replay so you can make a better decision on whether you think it was ball to hand, or hand to ball". Or the 3 Notts Forest pens, where for the handball it was impossible for the ref to see what happened as his vision was being blocked by other players, and for at least one of the "young kicks another player" ones, he was also behind another Forest player so was not in a position to see what happened?
Or the Doku assault on Mac - listen to the audio, and its clear that the ref thought he saw doku kick the ball before then Mac "ran into" his boot - were you content that it was not given as a penalty on the field?