That's the frequent topic here for many years, let me break it down for you, if it helps:
1. Select the 5 to 10 services based on your needs.
2. Review their reviews and look at how long and how much the service is active daily.
3. Check how frequently the seller responds to queries over the thread instead of checking PM.
4. Prepare questions about your needs and service. The questionnaire form should include all your relevant queries, so if the seller is experienced, they will love to respond in detail.
5. Shortlist 2 to 3 services and ask if they can give you a review of a few links or what you need to test at a discount. In most cases, sellers love to provide review copies in exchange for your honest review.
6. Test the water with a review copy or order the smallest package to test.
7. Once you have the reports or delivery, you can order what you want based on their quality.
In my experience, I love to order here because the sellers here are more educated in their niches. I tried Fiverr and Upwork, but those who are good at their work quote really high prices, and with lower prices, they are not going to give you satisfactory results. Not all, but in many cases, I feel this difference. Here on BHW, you will receive what you ordered, and sellers are supportive because the forum is well-moderated.