Asking for feedback is different from asking for a mentor. Feedback is a once off request and a mentor is an ongoing commitment that requires a great deal of effort/time which is expensive.
I will give you some feedback but I don't want anything in return:
- Don't give away your models for free (as per your request in this thread).
- Yours models are too cheap, your prices are undercutting other sellers.
- The customers that come here are also 3D artists and are looking for products that save them time and are high quality. The product should be either very detailed/difficult to make, in demand or unique/hard to find. Yours customers are most likely experts who need something in a short amount of time, quality is of utmost importance.
- Presentation consistency, your products have black backgrounds, white backgrounds, different angles. Try to keep some consistency for a professional presentation.
- Demand, are people looking for those products? Do your research.
- Product descriptions, you have about 1 sentence per product. People need to know more, description, features, file formats, use type, technical, etc.
- You should be more specific in your questions, are you asking because you are not selling much? Good answers come from good questions. If you are not clear in what you want then you wont get it. This is almost akin to this thread, you write one sentence and expect people to interpret what you mean by it. Be specific, write a list of questions and put some thought/effort into it.
- There is also many many threads on these topics already, just spend some time and search for each one you might learn a lot.