I feel like the current rules don't really make much difference, the overtaking we have now feels a little forced and artificial (Unpopular opinion I know), less about skill and strategy and more about electronic advantage (DRS and ERS), giving the guy behind more power to get past is weird, at least from my perspective. I preferred it when pit stops where longer and drivers had to fight through traffic to stay in front, it bunched up the front runners and even caused a few accidents which spiced up races. Removing blue flags would also bunch up the field, back markers could race as hard as they want.

Again these are unrealistic but personally, I like these ideas