Thanks to Stonewars.de we now have some information as to which LEGO sets will be retiring by mid-2021. The most interesting set of note is the Star Wars AT-ST Raider (75254), as this information comes in the wake of the contract termination for Gina Carano, the actress who depicted Cara Dune in the Disney+ hit TV show, The Mandalorian. The announcement of this news has caused the value of the Cara Dune minifigure to skyrocket on the aftermarket. We can only guess that the release of the information surrounding the set reaching EOL (end of life) status will only exacerbate its value further.
Disclaimer: Stonewars reports that they receive this information by means of contacting the major distributors/retailers that carry LEGO products, and according to their information, they are reporting that by March of 2021 they will no longer be receiving shipments of these particular LEGO Sets. That being said, they may still be available from LEGO directly on Shop@Home.