My dryer takes several cycles to dry clothes

I’m having a problem with my dryer drying the clothes. I have to turn it on at least three times before clothes are completely dry. It does get hot just does not dry clothes on the first or second cycle. Today it took me running 5 cycles before it dried the load. I’ve cleaned all the lint from all areas including the vent but this has not helped. Is it the heating element or something else? Please respond. Thank you.