The Energy Cap!
I think F1 should look at how to even the playing field. The smaller teams can't compete because they don't have enough money, tools, employers etc. whatever the cause maybe. If you wan't to even the everything out you should look at how the cars are produced. Cars are produced by resources like manpower, tools etc. But the most important ingredient is electricity. Without electricity you can't run the factory nor any of its facilities.
So to create a level playing field the FIA should introduce a energy cap. I don't know how much kWh every team uses per year. But lets say the bigger teams use 20.000 kWh a year and the smaller teams are know only using 10.000 kWh. Lets say the FIA sets a limit of 8.000 kWh a year. Big teams know have to make a choice how to use their capacity of 8.000. Big teams have a lot of simulation tools big supercomputers etc. The FIA know only looks at the amount of kWh you use not how you use it. Teams that have an excess of 600 people in staff now have to think twice about how the allocate the most precious resource in F1, energy. This limit would mean smaller teams, more efficient use of energy and level playing field.
The engine manufacturers know would also have a limit of 3000 kWh per team ( just a randon number). So Ferrari has 2 teams then they can use 4500 kWh. Mercedes has 4 teams to make things even they can use 7500 kWh a year. This will encourage manufactures to support more teams. Which is healthier for Formula 1. To monitor this the FIA just needs to install some energy meters at each factory. If you go over this limit you are automatically disqualified for the season.
The FIA should take values that are based on a FIA team with 500 employees. Teams that don't have a wind tunnel also get the same amount of kWh allocated and their consumption will be monitored accordingly. This is the only way to make F1 "policable". Teams can't make infinite amount of updates anymore because the energy allocation doesn't allow that anymore. So even if you have big budgets you will have to smart about how you use your energy allocation. So big teams still have better resources available but they can't use them as they like anymore. They will have the same restrictions like any other team.