Only Pro can help in such situation.Marketing is tedious (I have spent a lifetime in advertising) and requires plenty of budgets.
But with limited resources and segment you are on have to reach niche only can be done by self initially.
Make and develop concepts.
As you were in advertising sector
You know what works offline.
Online game is different but basics are same.
You have to device New Ways to move deep into the rush and target right people.
I am still in advertising business for print and worked earlier for TV Media also.
A small business has to grow gradually only.
Regular Experiments in business is the key to success.
Earlier most of people were taking risks as income was there.
In recession advertising results are less but brand image building is possible now only.
Social Media sharing is possible with new concepts to work upon.
You have to do it now as others have no such vision.
May be yourself without funds.
Majdoori karni padegi abhi to !