C# .Net WCF Service Performance Improvements

We are a small company with limited resources and are looking for an experience developer to help with an issue we are having with one of our WCF Services written in .Net 4.7.2. By default WCF should be serving multiple concurrent requests, but we have found that ours is queuing the requests which causes significant performance implications when receiving up to 100 requests a second. We also have some general improvements that need to be made to the Entity Framework database implementation of the service as are making multiple trips to the database when this could be reduced to a few.