Chess.com's opening book

I played on this site for years in the past and recently started to play on here again. I have always loved the site and wished it was around when I was younger. I would be a much stronger player than I am now. I liked to play correspondence chess games in the past because I was able to access the opening book and I would explore lines of play that I had not seen or played myself. I was quite surprised and disappointed that the opening book now only goes about 5 moves deep or so. Does anyone have a good alternative to this issue so, that I can continue with my work with learning alternative lines and further my studies on the positions that come up? I used to set up a physical board in critical situations where I could explore these nuances. That is how I learned the French and a few other openings which helped my understanding of pawn structure ect. Any help would be appreciated tremendously!! I am disabled and can't afford to upgrade my account. Thank you, Badbeatbobby