Overall smaller car, no engine capacity or type limit, but limit the amount of the fuel available per race weekend (conversion calculated for diesel, electric, nuclear or exlazer, whatever). No little detail legal languages on the aero but set the maximum surface area allowed on a car. There are other things, but this is where I’d start.

Suggested by JBJB

A smaller car is a given, the current cars are just too big. You could do the fuel limits by restricting races to a certain number of kilowatt hours of energy deployment, and the fuel source wouldn’t matter. I don’t dislike the surface area rule, but I worry about the ways it could be gamed. Maybe that’s the point. 

Go back to naturally aspirated V12s. Let the drivers race. Also, put the races on for free on Youtube so I can actually watch them.

Suggested by ChaosphereVIII

I’m going to go out on a limb here and say the problem with F1 isn’t its powertrain. Apple TV is good, actually, and it’s worth the $12.99 per month. 

Require all of them to install drone capabilities and give them missiles also make it on the moon.

Suggested by Russell Garcia

I don’t hate this, but the logistics are a nightmare. 

1) No more B teams

2) More variables as others have mentioned. Allow each team to choose V10, V8, V6 or V12 engines, up to 2l max for turbo, 3l for normally-aspirated

3) Make the cars smaller, like 2000 size. The current ones are too big and prevent overtaking

4) Fire that clown Hermann Tilke out of a cannon and get a real track designer who can make challenging circuits that allow for overtaking

5) Get rid of all of that energy recovery junk

6) Bring back Kyalami and other classic circuits (provided that they can be upgraded to spec)

Suggested by QADude

I agree that B teams should be banned. I do think, however, that factory teams should be allowed to run a third car if they choose, and smaller budget teams should be allowed to focus on one car instead of being forced into fielding two. 

Ban carbon brakes, ban the hybrid electric, enforce track limits. This will make the drivers drive the track, making many more passing opportunities.

Suggested by Jeff OBrien

Track limits are dumb and bad. If it’s paved you should be allowed to race on it. If you don’t want drivers putting a wheel there, make it gravel. Hybrids are good, actually, and make the cars significantly faster than internal combustion alone. Carbon brakes should be outlawed in general, for all racing and street applications. 

Three things

1. Cut amount of mechanics to service the car during a pit stop in half. No more three men per wheel and such and stops will get longer.

2. reduce front and rear wing size by 35%

3. shrink overall car size by 20%.

Suggested by monsterajr1

If you ask me, F1 teams should be aiming for 10 second pit stops instead of two seconds. Smaller wings will probably look ridiculous, I would personally go for a no-wing design to ensure the cars are too powerful and don’t have a ton of downforce.