They should be working to implement fully automated offside calls anyway. Once that’s done, a huge source of frustration will be dealt with.

If the quality of VAR calls still doesn’t improve after that re: handballs, penalty calls etc., they can still take more drastic measures such as outsourcing VAR to a third party that is completely unaffiliated with the refs on the field, or even leaving all subjective calls to the on field refs and simply not interfering with handball/penalty/red card calls anymore.