I am co-founder of a startup that have some products with kinda average traction (but no profit), and not enough money to finish our flagship product (but I thi

I am co-founder of a startup that have some products with kinda average traction (but no profit), and not enough money to finish our flagship product (but I think we can make a the rewrite of the demo... the first demo is on Google Play). How I would convince a angel investor like you to help?