You need to leverage "the channel".

Basically, from what you described of your software (E-commerce for SAP ONE) - it's not out of the box software.

You'll need someone to do integration, training, support, sales, etc.

You can either be a direct seller, and do all of those things inside your company, or partner with consulting companies/agencies/system integrators that will resell your software, and then add services and support contracts on top.

Don't try to sell directly to customers - you can't afford to reach them, and you can't afford to be in sales cycles with them.

Instead, make it worthwhile for consulting companies who already have these clients to resell your solution. They'll be your real customers!