Usually asthma is treated with stepwise approach.
The treatment you are on is meant for step 5 therapy.
But the symptoms you have mentioned come under step 3. So you are already taking medications for the most severe type.
IN spite of it if it is worsening, then the worsening or trigger factors are to be looked for and treated which include smoking, infection, allergens, certain medication, certain food, air pollution, certain occupational factors, hormonal factors, stress and GERD.
There is also an entity called steroid resistant asthma.
My suggestion -
Treat the trigger factors.
Take the antiasthma medications as advised by your doctor
If still worsening consider newer form of treatment like immunomodulators.