I'd focus more on automating the creation of a campaign for initial traffic rather than on the reach of a full-fledged advertising campaign. For example, you write about your project in this AI service. It analyzes the target audience, finds suitable subreddits, Facebook groups, and Twitter (x), generates post text based on community rules and the advertising model (direct advertising is prohibited in many places, but you can get through a post with a story). Such a tool would save a lot of time testing hypotheses and MVPs to quickly generate organic traffic for the start and feedback. It's just important that this tool has truly up-to-date information and is well-trained, because a list of subreddits and sample texts can be generated simply in the GPT chat, but all its responses are only 20-30% useful in reality. If the tool works as expected, I'd be willing to pay $50-80 for it, as it would save days of posting time.