What is the most logical next event?

How to treat polycythemia vera
Discuss aspirin with your doctor.
Aspirin can be used to reduce the risk of things like blood clots and strokes. Your doctor may want you to take a low dose of aspirin each day depending on your current health.
Usually, aspirin is the first course of treatment. Doses are usually around 81 milligrams, but your dose may be lower or higher depending on your health.