How to manage a project with a huge number of consumers?

Question

Project management

Good afternoon!
Recently, they offered to work on a project that is 4 years old and now 5 people have left the project. The service has a huge number of consumers and everyone regularly writes letters, there are many different problems and errors, analysis is needed everywhere. A huge number of letters, meetings and calls. Lots of wishes from consumers. I understand that I can not cope with such a flow. In fact, you have to do your own work and help in the analysis, etc. I can't do it all.
How to deal with such a project?

Answer 1

It is obvious that a support service is needed, which will fix requests and transfer them to development. You have already been told about prioritization. First of all, respond to those problems due to which you can lose money or customers.

Answer 2

Here it is already clear that if the load is 250 percent, then you can lose more than get from customers who have not yet completely run away.
The answer is obvious that it is necessary to delegate to a no less intelligent specialist in the same field, a product or a manager account.