First thing, is I would lean on your experience of renting to Section 8. Your story, your success and, of course, the challenges you faced, encountered, and how you overcame them.
In my honest opinion, there's nothing better than your own experience. Have a webinar, Eventbrite, or in person event, where you invite local or out of State landlords to come learn more about the things that worked for you. Have a theme for your event. Peel back the curtain and share those things that you serve, be it the the property owner or the potential tenant. This way those property owners can relate too. Do it consistently, even if only one or two person shows, and brand it as the expert in that space
Then give them more info about how the program works and help alleviate their fears or misconceptions they may have about the program, and the people who participate in it.
Offer to also be an advocate for both parties to assure the landlords, (if that is possible, I don't know, not really my space) that they will be able to have open communication with potential tenant. It's important that the landlords that you are representing or approaching to consider renting to the potential tenants know that they can communicate openly and honestly with those potential tentants.
Emphasize the protections provided they Fair Housing Act. Depending on the property's location, Section 8 voucher holders are considered protected class (***in some places*** ), and cannot be discriminated against based on their income, including housing vouchers. And if they do, they could face legal action.
Offer support and assistance. If a landlord is concerned about the process of navigating the paperwork and requirements, you can offer to provide assistance and also information about local housing agencies and advocacy groups that can provide additional support.
Teach property owners how to understand terms of the Section 8 contract and what is expected of them as a participating landlord. Educate them about the benefits of accepting Section 8 vouchers: Section 8 vouchers can provide a reliable source of income for landlords, as the voucher program pays a portion of the rent directly to the landlord on behalf of the tenant. This can help to ensure that rent is paid on time and in full. Additionally, the Section 8 program screens tenants, which can help to reduce the risk of problems such as unpaid rent or property damage. Not always the case but this is where your story and experience makes an impactful difference.
Address any specific concerns the landlord may have. Work with them to address these concerns and provide reassuarnce that the potential tenant (client) that you have will held to the same standards as any other tenant.
Get to know the potential tenants, which you noted, you have a long waiting list of clients seeking rentals and are desperate. Property owners should take the time to get to know the potential tenant and learn about their rental history and any other relevant information, and if you know your clients; you will not only be an advocate for them, but in some way be also an advocate for the property owners - by bringing the two parties together successfully, which not only benefit them both financially, but also serve housing needs of those in that need them the most.
Build trust and understanding. Good luck.