I've been doing that again since last season with the Splinterstats report card, although it recently removed the ability to track tournament performance so I need to add that in myself. I wish I had the technical ability to pull the data and create the charts that you do so well in your articles (brawls too!)
You can try this tool by beaker007 https://peakd.com/hive-13323/@beaker007/splinterlands-statistics-v0110-add-land-monitoring,, I am collecting data from this tool. I also used some few other tools like splinterstats for knowing exact Rental spend, https://www.splintercards.com for reward card monitor and splex for seasonal reward cards earned. other than those I used canva for making chart. It will be easy once you start doing it.