My thought is people are averse to fees - but there needs to be a bit more of an impetus for someone to switch to your platform. Will you be using ETFs to gain exposures? If so, a lot of the marketing could be focused on diversity of investment or saving for retirement.
A lot of the reason the robo's have taken off is that some provide "fractional ownership". So you can invest as little as $1. There is some legal and compliance issues you would need to iron out in your home country. The "Acorns" approach is a good one in my opinion. Helps you get many small accounts quickly.
Ultimately, performance is what a lot of people go by. You need 5 years. Once you have 1 though - with 7% fees - you can easily start showing expense ratio drags on portfolios...
About performance, I agree, it will take some time until regular people start noticing the difference.