[threeseed]

The easiest way for me would be to find a product with an App Store e.g. Shopify, Confluence and build apps for it. Potentially find niches that would be useful just to Bangladesh and work from there. Or look for features that are popular in competitor products and add them.

This at least won't cost you anything except your time.

[fallinditch]

I think this is good advice. I would also add: get in to the freelance mindset whereby, in times of slow business, you put on your sales and marketing hat and devote a significant proportion of your time to selling: contacting, networking, hustling.