Use one of the following gods and drop heals for team mates when needed. You will get this quickly.
Using Rod of Asclepius will increase you healing by 15%
Healers in order of best to worst healers:
Hel (Area heal - Best for this)
Ra (area heal over time in a set location)
Chang'e (area heal focused on you)
Sylvanus (area heal focused on you over time)
Aphrodite (Single target heal but strong)
Cupid (3 hearts that heal)
Isis (Ult area heal but long recharge)