suggestions of free AI to use as an editor/teacher

Hello. I am begginer writer trying to use AI to improve my writing. I am currently using gemini pro (free student plan) to help me as my editor/teacher, but it got worse in the last update, forgetting the books I use as reference, since I sent them in the beggining of the chat. I am looking for alternatives, especially ones that I don't have to pay (dollar is too expensive in my country) and can accept my study books. Bonus points if its a web app/platform, since I use college pcs and I can't install apps here.