i made a whole desktop app for pos system like for every shop

I spent the last year building a desktop POS and inventory management system for local retail shops. It handles sales, expenses, inventory tracking, reporting, and can even work offline when there's no internet connection. A few businesses in my area have started using it, and it's been interesting to see how different shop owners manage inventory and sales. For those who have built software for small businesses: what was the hardest part of growing beyond your local market? Any lessons on distr