I remember back at the days I was able to make a 1000$ rig with 2x 290s Crossfire or at 1200$ a rig with 2x 970s SLI

You could pickup at decent prices sometimes a brand pre built gaming PC from Lenovo or Hp for example.

Amazon.com: [Geforce RTX 3060] 2022 HP Pavilion 32GB RAM, 1TB SSD+2TB HDD, Intel i5-10400F

It's around 1150$

I think keyboard can stay wired since it doesn't move at all.

Headset on the other hand and mouse would be cool without cables since both move all the time, but make sure you've got a lightweight ones - I'd go with Logitech G435 / 535 / 733 (depends on your budget but all of them are good) and Logitech G305 / G Pro / Pro X (the first one is on standard battery if you don't mind changing it once in a 2 months or so and a bit heavier)

You can complete the aesthetic look of no cables with Logitech keyboard to complete the set but it'll add up your purchase price by 33% - but it's up to you.

@ni6htmare01: I would suggest you to go small but also with a window? if you're already spending that much of money it's better to show off and stare at that box all day :D

CoolerMaster MasterBox TD300

Fractal Design Define Nano S Window

@ni6htmare01: Have you thought about which mini ITX case you're going to use for that build?

Does it happen in other games? you can try to lock the frame rates in game to 144 or 120 see if that helps, alternatively you could with turning Gsync if your monitor supports it and turn off vsync in game.

Many games still hang on 1 core, so I would say clock speeds are the most important, but I do start to see smarter game devs that do utilize more than just 1 core to make more efficient resource balance in their games.

Ryzen 5 and i5 have 6 cores, so I would say 6 is the sweetspot.

Age of Maxwell cards and their power efficiency is long gone, they keep adding volts in order to stay relevant in the competition market demands, until they'll come up with new efficient architecture once again.

Make sure you connected the monitor to the GPU DP or HDMI port and no to the MOBO.

Make sure as been said by @BassMan the monitor isn't configured as 60Hz from it's own settings (you can get to monitor settings via it's own buttons - usually below the monitor or on the side of it)

Make sure from Nvidia control panel it is set to 144Hz refresh rate, you should be able to run 4K at 120Hz and 2K at 240Hz using DP 1.4 or HDMI 2.0b to reach 120-140Hz

Are you using multi port and/or electric guard appliance? it could make electrical interreference.

Where have you connected the TV HDMI cable to the PC? dedicated GPU or MOBO port?

It might be the HDMI cable too long? lower quality of cable?

The issue is hardware problem of some sort, IMO it's either the cable too long and/or made out of cheap quality materials (not a quality brand) OR too many appliances instead of direct connection to the wall socket which can make lower quality electrical signal to be transmitted.

EDIT: nowadays there're Nvidia and AMD audio drivers being installed part of the full driver package, you could plug your soundbar via HDMI port to your GPU if you have one dedicated and the sound will be transmitted via your PC - it could solve your problem if you've got faulty onboard audio driver.