I made a post a couple days ago now I NEED advice

I made a post a couple days ago about failing many interviews and being added to a project a month after failing the last one. The project wrapped a few weeks ago. I interviewed for the popular role, video annotation specialist. I was super pumped given the 50-90 pay rate. First interviews I passed on my first try, and I was luck enough to give a partial interview. I literally yelled inside my house I was so excited when I saw 2 emails in my inbox. Then I opened the email. My contract rate was 25. Which is great. The project that just finished was at that rate. But I was super surprised and bummed. I have seen people getting 60 & 90 for the exact same project. I did not sign the contract yet. I sent an email reply to the person who sent over my details. I'm wondering if any of you have ever had success negotiating a contract. IDK if it was a mistake or...? Obviously I cannot speculate. I have had success negotiating with other platforms. But I am worried about the number of people on these projects. 10k video annotation and 10k generalist. IDK if they are related but I have heard folks assume that they are. Anyway. I would appreciate any insight, tips, advice, if you have had a similar experience.