There are several ways to promote your products on Facebook Marketplace and potentially increase their visibility and sales:

1. Create a Facebook Page for your business: This will give you a dedicated space to showcase your products and interact with potential customers. You can also use Facebook Ads to reach a larger audience.

2. Optimize your product listings: Make sure your product descriptions are clear and detailed, and include high-quality photos. Use relevant keywords in your listings to help your products show up in search results.

3. Join Facebook Groups: Look for groups related to your niche or industry and join them. Participate in discussions and share your products when appropriate. Just be sure to follow the group’s rules and guidelines.

4. Offer promotions: Consider offering special promotions or discounts to encourage people to buy your products. You can share these promotions on your Facebook Page or in relevant groups.

5. Encourage customer reviews: Positive reviews can help build trust and credibility with potential customers. Encourage satisfied customers to leave reviews on your Facebook Page or product listings.

Overall, promoting your products on Facebook Marketplace requires a combination of creating a strong online presence, optimizing your product listings, and engaging with potential customers through various channels.