opting for composition scheme

As on 30/06/2017 I had closing stock of around 20 lakhs and I could not opt for composition scheme under GST act as 90% of my closing stock was purchased from interstate. even now at the end of 31/03/2019 my closing stock will be around 24 lakhs where the same thing that 90% of my closing stock is purchased from interstate under GST act and also was the old stocks purchased from interstate when the KVAT and CST act was exist. Whether I am eligible to opt for composition scheme w.e.f. 01/04/2019 or any stock declaration is to be given.
can any body explain me.