44AD Return filling

Dear expert,
my query is that i have been filing my itr for 3 years as per ITR 4 and then filed ITR 3 for the fourth year and ITR 4 for fifth year. now i would like to ask that whether i was suppose to get my audit done for the year in which i filed ITR 3 since some people saying that we can switch forms of ITR as per income and some saying we cannot switch forms for 5 years. some saying audit only required if income declared below 8/6% and if income reported above 6/8% then we can switch forms without audit and should i file ITR 4 this year or should i file ITR 3