[andai]

You could first ask a LLM to compress your notes. There was some informal research into this a while back, LLMs have the ability to translate text into a much shorter representation that only they can understand. That might allow you to get around the context size limits.

More practically (or additionally) you could just ask it to summarize them or extract the most relevant parts.

Alternatively, I think the most popular approach is to use a RAG thing though someone else will have to fill you in on the current state of the art.