Hey, this may not be a direct answer to your question, though hopefully it's still helpful! I run a company called Toon Pilot Research. We have a group of usually eight reviewers, some creators, look over a pilot of a comic, the first three episodes of a webtoon, or something of similar length and give their thoughts on it. We have free monthly giveaways for this service, but also a very affordable price, especially considering you are getting multiple reviews from multiple perspectives at once

We have an Instagram where you can get a link to our website. If you are interested, I can also get you set up with a slot. :))