Did you question your Doctor about it? You need to take advice from a medical person and not laymen like us, We can help each other with general stuff or our own experience, but in matters of the heart it's best to seek the info from your cardiologist, if you don't have one ask for a referral.
Actually, the average ejection fraction is between 55-75% so having a higher one is fine. Our heart needs to have some blood left in the heart when it pulls blood into the heart. It does not push all of it back out. If it goes below the 55%, then doctors begin to look at why the heart is not functioning at capacity.