For most survivors, yes, though “better” rarely means the fear disappears entirely. The more honest and useful word is subdued. The fear can be subdued to the point where it no longer controls your decisions, no longer dominates your days, and no longer prevents you from living the life you want to live.
What tends to help most is time, peer support, and appropriate psychological care if needed. Understanding that the anxiety is a normal response to an abnormal event, rather than evidence that something is still wrong, is itself a significant step for many survivors.
The fear may never fully leave. Many long-term survivors describe an ongoing awareness of their mortality that was not there before. But awareness is not the same as fear, and fear is not the same as it winning. Most survivors, given the right support, find that they adjust, and that life on the other side of a cardiac arrest can be rich, purposeful, and genuinely good.