You can promote a CPA lead offer on platforms like Facebook Ads and Google Ads. These platforms allow you to target specific audiences based on demographics and interests. You should also consider using solo ads to reach interested email subscribers. Forums and online communities related to your niche can also be a good place to promote your offer but you have to be strategic about this approach. You can use Instagram and Twitter to reach potential leads through engaging posts and ads. Another option is native advertising on websites that attract your target audience. Tracking the performance of each platform will help you optimize your campaigns for better results.