It depends entirely on why your cardiac arrest happened. For some survivors, the underlying cause is identified and successfully treated, which substantially reduces the risk of recurrence. For others, particularly those whose cardiac arrest arose from an ongoing arrhythmia or structural heart condition, some elevated risk remains. This is one of the reasons an ICD may be recommended.
Your cardiologist is the right person to discuss your individual risk with. They will have assessed the cause of your arrest and the condition of your heart, and they can give you a clearer picture than any general answer can. It is a reasonable and important question to ask directly.
Living with uncertainty about recurrence is one of the harder aspects of cardiac arrest survival, and the fear of it happening again is one of the most common concerns survivors raise. It does not mean the risk is high. Many survivors find that understanding their risk, even if it is not zero, is less frightening than not knowing. Peer support from others who have navigated the same uncertainty is something our community offers in abundance.