Haven’t Played Since La Resistance—What’s New?

Hey everyone, I last played when La Resistance was the latest DLC. Haven’t touched the game since because of life, but now I finally have some free time to dive back in. (I know, i missed quite a lot of stuffs).
What major gameplay changes or new mechanics should I expect? Any DLCs that are must-buys—or ones I should avoid? Also, any recommendations for a fun country to play with all the new updates?
Thanks in advance!