Personalized AI assistent

Hello,

I have an idea to create a personalized AI assistant that will interact with users, store the data they provide, and give advice, ask questions, etc. on a daily basis. The question is, what technologies should I use? Because using a simple fine-tuned gpt will not work, it will be very expensive to load all the user's information into the GPT every time you start chatting with the AI, so that it knows how to communicate with that user. Therefore, I am thinking of using a vector embedding solution.
Maybe you have done something similar? Do you have any tips?

if you are asking these questions I suggest not doing this because it seems you lack a ton of fundamental knowledge to support your idea.