Multi RAG model and LLM

I need to integrate current project to have customized chats with unique knowladge, so each account has his own knowladge and can talk with the AI. In order the knowladge is missing the syetem should sent question to general LLM.

Current project in react and nodejs , aws

Optionally also Avatar AI generation like emulateme

Plus put real prices , experiance and project examples and estimated timeline