thank you for putting your query.
you should complete the 6 weeks course of Isotretinoin
20mg.even after that if there is no improvement in your acne
you can have same drug on alternate day basis or 10 mg instead of 20mg for another 1 to 2 months but only after consulting your doctor and under monitoring considering side effects of this drug.continue applying creams and facewash you have.
even after all this if there is no improvement then consult skin specialist,as there are many minor procedures are available for acnes.take care.