I want to play an easy shooter where you feel like you're in a flow state aiming at targets, the only time I've ever felt like that was in the PS2 Medal of Honour, kneecap, helmet shot, head shot or up till MW4 original.
I've tried the latest CoD and the cinematics and cutscenes are just overblown.
Borderlands would be a kind of turn off your brain type but they haven't made a new game in awhile.
Helldiver had great shooting but the grind, limited levels and multiplayer means I wasn't too invested in it after a hard days work
Absolutely second the recommendations of Doom and Quake here in the thread. Boomer shooters in general. Even if the movement can be really fast, playing them on your own can be extremely cozy. Just get into the rhythm of circle strafing, shooting and weaving in and out of cover and you'll be in the zone very quickly. Bonus point, that both Doom and Quake have 30 years of EXCELLENT quality player created content that can keep you playing fresh new levels for as long as you want to. You could play them for the rest of your life, at your own pace and preferred difficulty.
The new rereleases of both games even bundle a mod browser that you can access with zero knowledge of modding, just hop on.