If you are looking to hire a thumbnail designer for your YouTube channel, you can find many talented and experienced designers on freelance platforms like Fiverr, Upwork, and Freelancer.

When searching for a thumbnail designer, it's important to review their portfolio and read reviews from previous clients to ensure that their work meets your standards and expectations. You can also consider reaching out to potential candidates and scheduling a consultation to discuss your project and see if you're a good fit.

When creating a gig or job posting for a thumbnail designer, be sure to provide clear details about your brand and the content of your videos, as well as any specific requirements or preferences you have for the design of your thumbnails. Additionally, be clear about your budget and timeline for the project, so that potential candidates can accurately assess whether they are able to meet your needs.

Remember that communication and collaboration are key to a successful working relationship with a thumbnail designer, so be sure to provide feedback and guidance throughout the design process to ensure that the final product meets your needs and reflects your brand.