A little basic road rules so that they aren’t behaving "unpredictability " to cars.
The moment you start adding these rules for "safety", the quicker car drivers will find themselves exempt of guilt if they get involved in an accident that could be avoided if the driver was paying more attention.
Most importantly I want helmets actually being enforced. Normalized.
Take a look at the Netherlands, see how many people use helmets.
The more barriers you require from people to use a particular mode of transportation, the less people will use it. We need to increase the amount of requirements to drive cars, less from cyclists. "Enforcing helmets" is counterproductive.