I'm a G-Sync user myself. I also use a 144hz monitor
(Acer Predator XB271HU bmiprz 27") well technically it can overclock to 165hz but haven't bothered messing with much in the way of settings. I went with IPS over TN as the accuracy was more important to me than response times. The main real time games I play are RTS as opposed to FPS. I haven't really run into that many games that have cause me to want to / need to mess with much in the way of monitor or graphic tweaking. I hit the 144 FPS in most titles without an issue. I'm curious if overclocking it to 165hz would provide any noticeable difference? It seems small enough to not be noticeable? I haven't used any of the higher than 144hz refresh monitors to know how large a difference it makes though I've heard they're quite crisp. I've not used FreeSync to compare it.
Also I can never remember if G-Sync also works the other way & it lower frame rates if needed? IIRC that's a different setting.

I used to mess with graphics a lot back in the day but with this new system I haven't really needed to. As it's been so long I seem to have forgotten even some of the basic terminology.
I originally had considered a 4K monitor when shopping for one but didn't think my system could handle it.

That & for what I was looking for feature / quality wise 4K just seemed like to many compromises to keep within my PC / Monitor budget.
At least in terms of the performance I was looking for it seemed like 4k would require a 2080 TI. I can't afford a TI. 1440p seemed like a good compromise. Though I must say the whole G-Sync licensing thing dropping prices a bit not long after I acquired my monitor was a bit of a disappointment but it is what it is. I'm just happy to have a nice setup.

I've found that simulated 4k with DSR seems to also be a decent compromise for some titles. I also use ReShade / SweetFX / ENB / Etc. as desired. Due to cooling issues (& a lack of a need right off) I haven't messed with overclocking my processor or graphics card though they are both overclockable. A 9700K & a
Zotac 2080 AMP respectively.
I'm not at all familiar with Zotac FireStorm. I've no idea if that utility works well or not. I have some very minor knowledge of MSI Afterburner / RTSS. At some point in the future I'll likely run into games that might require me to consider tweaking or overclocking but for now I've done alright. Speaking of graphics that reminds me I need to take a break from MTG Arena & finish up my X-Com play through as I've mentioned before (Note to self

).That & I'd like to find a FPS to install. Occasionally I enjoy a FPS to blow off steam etc. but haven't decided what to go with next. I'd jumped back & went to play through the Unreal Tournament sequels as I never played them but am considering just grabbing a more modern title to see how well something more intensive would look on this machine. As the UT games are entertaining but so many of the older titles seem to require a ton of tweaking to work on modern hardware / resolutions / etc.
I have some FPS in my back log already but haven't decided which if any are worth a play through. Shadow Warrior 1 & 2, Space Hulk Deathwing - Enhanced, WH Verminitide 1 (I've heard skip 1 get 2?) & the Unreal games I mentioned to name a few. If I do play a FPS I'd like it to be something "fun" to play through. I prefer single player. I've heard the Doom games where entertaining single player I might have to consider grabbing one of them.
Any recommendations in that regard for something FPS to play single player when I feel like a change of pace? As I said I'm not that familiar with genre & have a few sitting in my backlog. I just have no idea if any are worth playing... Or if there's anything that came out over the years or recently that's considered a standout in terms of being a single player play through that would be worth taking the time to play.