Shortness of breathe. Should i do now?

In May 3 months ago I had a feeling where I have to take deep breathe from mouth in between which gradually got improved but from then I am having difficulty breathing where I have to take 2-3 deep breathes after climbing stairs and walking while taking weights.I consulted with the cardiologist who did echo screening which came back normal and showed LVEF 60.I did MDCT chest CT scan without contrast 10 months ago which was normal as well because I had viral and it took time to resolve and at that time I got cough in blood from severe dry cough but then my dry cough got stopped and also did not got blood in cough afterwards.But now I am facing these breathing issues.What should I do now?