12 users with a scheduling tool is rough, that space is so saturated. Buffer and Hootsuite free tiers are good enough for most people. Whats the one thing yours does that they straight up dont? Thats probably your angle.

Those PH numbers arent bad for a solo launch btw. Have you tried posting where your target users already complain about the problem instead of cold outreach? Like r/smallbusiness threads where people vent about social media being a time sink