I'm loving Far Cry 5 (on Xbox), but I've purchased Far Cry 3 and 6 on this sale. I've heard mixed reviews about 6, but great things about 3 (if it still runs normally on a modern pc). I also took a dive at X4: Foundations, but never played any of the series. Hopefully everything is fun.
3 plays great on my PC. I made the mistake of playing 5 first, so I found the graphics & mechanics a little underwhelming (I thought 5 looked pretty great). But the game is good; the villain seems to be the series' fan favorite.
4 might is the sweet spot between 3's gameplay and 5's graphics. 5 is gorgeous, but it's gameplay is a tad more kid-friendly than 3 and 4. And I love 4's James Bond villain.
I also just recently got back into first person games, after growing up with OG Doom, Hexen, Quake etc.
Some recs that I really enjoyed:
Dying Light -- the best of the parkour-style shooters I've played, including Mirror's Edge. Great melee too.
Doom '16 is a great, really satisfying shooter that I recommend, but Doom Eternal is a whole other beast; I'd compare it more to Thumper, which is an intense rhythm game a la Guitar Hero. It's stressful and I haven't completely finished it, but it is an experience.
Dishonored 1&2 are both outstanding stealth FPS, which a painterly art style that stays looking up to date. Adds some superhuman powers to the shooter formula.
Prey '17 -- also by Arkane, Bioshock-like, spiritual sequel to the Dishonored games.
Borderlands 2 -- great guns, great villain, and so many memes that it probably feels like a reddit time capsule at this point. Mechanically it's missing some 2023 stuff like crouch sliding, but it is outrageously smooth gaming with the most enjoyable spread of enemy types in any game that I've played.
I do actually own Dying Light, Dishonored (1), and Borderlands (both). I really need to get back into those again. I remember Prey and Doom, but I haven't bought them yet. I couldn't really get into Dishonored for whatever reason, even though it looked fantastic. I'll have to revisit that soon after Far Cry 3, 4, and 6.
I think the peaceful vs chaotic option in Dishonored can make sinking into it a little less straightforward than the others, kind of like Deus Ex -- except Deus Ex is a more complete espionage experience than Dishonored, where non-violence is sort of just a roleplay choice.
I say go high chaos, even if it feels like the game de-incentivizes it, and just enjoy it as a shooter experience. If you decide you want to do a sneak playthrough afterwards, you still can.