I prevously had anemia but my levels are ok now, however I still tire very easily. What are some other causes of fatigue?

Many possibilities. There are many causes to fatigue. In addition to anemia, other possibilities include thyroid disorders, depression, anxiety, infections, insomnia (and the many causes to insomnia), diabetes and other chronic diseases, and a whole host of other maladies. Best to see your doctor to make a diagnosis after a thorough work up.