I think the problem is all the cars are too similar. The fia should say. Right have any engine you want, and airodynamics. Then some teams might run lighter more economical engines so they are more reliable and earlier in the race may be faster. Some teams however might choose to run some massive monster of an engine that drinks fuel like a thristy elephant they would be amazing to watch fast at the end of the race when they have less fuel to lug around however would be unreliable. Free rain on the aerodynamics would allow teams to try out daring ideas like the skirt idea some team had in the 70/80s. However to keep it safe they should keep the safety regulations. F1 should be the pinacle of motorsport. However other championships are getting close to f1 kinds of performace.