There is a pretty good Youtube playlist with loads of cycling documentaries on it Chris Boardman The Final Hour - YouTube
Wonderful Losers is very good and you can rent / buy here https://vimeo.com/ondemand/wonderfullosersfilm
My all time favourite is The Stars and the Water Carriers (from the guy that made A Sunday in Hell) The Stars and The Water Carriers: The 1973 Giro d'Italia (Better Colouring) - YouTube
Even if you can’t speak French this doc about Thibaut Pinot from 2019 TDF is enjoyable. You can understand most of what’s going on just because it is quite emotional and involves a particularly moving scene after Pinot drops out of the race - YouTube
I also really like this film that David Millar made and you can get it on most platforms https://www.timetrialfilm.com/
I haven’t watched this one yet. It’s about Michelton Scott and looks good Watch All For One Online | Vimeo On Demand on Vimeo