Less rules... All this "under review - issue a penalty" is crap. Let them race, if they wreck, oh well. Less rules for the cars too, give the teams and basic dimensions and pick a non-hybrid engine design like 3.5L NA engine... in other words, go back to the early 90's and let people inovate and race each other.
Too many rules. Things are boring exactly because of excess of rules. Because the rich teams will aways find their way through the rules.
The more you remove the rules, the more you allow the teams with larger budget and more innovations to run away from the rest. Just for this year alone, Mercedes came up with DAS and new suspension concepts plus other things, which now made their car a second faster than competition on a track like Hungaroring that is just corners. If you remove the restrictions, the gap could easily build up to 3-5 seconds in Mercedes' favour if we are unlucky.
If you want a better show where drivers are at the center point, not the cars, the only solution is to limit the engineers in a way or another.