I wouldn’t have killed Regan had I gone back in time, I would’ve gone a bit further back and after Rockerfeller got forced to sell standard oil, I would’ve offed him just before he was able to use the money he gained to form Chicago University and it’s dreaded Chicago school of economics.(home to the ludicrous idea that the free market will regulate itself) Which I think had even worse consequences than Reganomics, if not directly influencing it.
At the very least, it would’ve likely extended the 30 years worth of post Roosevelt economic prosperity that decreased wage gaps, and actively created the middle class at least a bit longer before some other rich butthole got the same or a similar idea as Rockerfeller.