Will cardioversion help regulate my heartbeat?

Convert not regulate. It hopefully will convert your abnormal heart rhythm back to normal, but to keep it there you may need medicine and avoidance of stimulants such as alcohol, caffeine, nicotine , illicit drugs and decongestants.
Possibly. Depending on the circuit and reason for abnormal heart rate, cardioversion can b helpful. Many arrhythmias respond to cardioversion, however, some do not.