deca is long acting, atleast 4 weeks or so.
I would use the topical solutions asap and continue the cycle:
Polysorbate 80 Shampoo ED
Nizoral 2% Shampoo E3D
Azelaic Acid 5% + Minoxidil 5% 1ml/twice a day
Spironolactone 2% Solution 1ml/twice a day
These items have helped thicken and regrow hair in receeding area that propecia never did plus they dont mess with sexual sides.