Overwatch and Rainbow Six Siege if you're lookin' for a new FPS. Something similar to DayZ (but a bit smoother in my opinion) is a game called Miscreated. When it was first released it wasn't in its best state but its really improved since then. You could also try GTA 5 because even after 3 years Rockstar still releases free (ish) content. Dead by Daylight is also getting some buzz lately, which is probably
really fun with friends. Of course, if you want to do a Lets Play series, a story game like Fallout 4 or DOOM (another great, underrated FPS) would be great. However, this is just my opinion. Do a mixture of games, whatever you think is fun and what you think your viewers will enjoy!