Anybody who's invested or think about investing into lithium should have an excel spreadsheet adding the production of every brine operator and spod mines in the world and convert it to LCE.
Keep previous years/quarters and work out your forecast for the year/quarter forward out of guidances and the market dynamics.
There are not that many lithium producers yet, this is only about an afternoon worth of research and announcements reading if you are good at googling.
You can then tally it up against demand forecasts, expected cagr of the industry, current demand etc.. to have a rough idea about what's happening.
After close to a year of reading, I believe there is only a small minority doing that on this forum and I don't understand why you wouldn't.