Question I need help upgrading one of my two computer builds.

[TooMuchViolence]

I have loved video gaming since the 1970s, and this will probably be my last gaming system. I have very limited funds and want to make every penny count.
I wasn't planning to buy the PlayStation 5 Pro, but I am considering upgrading one of my PCs for gaming and video editing.
If any mix-and-matching can improve one of these computers, then add a video card, power supply, and RAM.
What is the best I can achieve without using water cooling? Monitor is- QNED80 Series 50-Inch Class QNED Mini LED Smart TV 4K Processor Smart Flat Screen TV for Gaming
Here are some short questions:
What is the best video card I can get based on my current setup? Should I add more RAM, or is the RAM I have already outdated?
I am willing to spend between $600 and $1000. I would really like to experience the best in computer gaming, but that seems out of my reach. Thank you for any help you can provide.
I have two computer builds. One was way back in 2018 (I had more money to buy latest hardware). 2nd build was in 2022 and I had a lot less money. Both computers are running win 11
2022 build
ntel® Core™ i5-11600K Desktop
be quiet! Pure Rock 2 150W TDP CPU Cooler
ASUS Prime Z590-P LGA 1200 (Intel® 11th/10th Gen)
CORSAIR iCUE 4000X RGB Tempered Glass Mid-Tower ATX PC Case - 3X SP120 RGB Elite Fans
CORSAIR RM Series (2021), RM750, 750 Watt, 80 Plus Gold
SAMSUNG 870 EVO SATA SSD 500GB 2.5” Internal Solid State Drive,
CORSAIR VENGEANCE LPX DDR4 RAM 16GB (2x8GB) 3200MHz

2018 build
CM Storm Trooper - Gaming Full Tower Computer Case
Cooler Master Hyper 212 Evo CPU Cooler (RR-212E-20PK-R2), 120mm PWM Fan,
CORSAIR VENGEANCE LPX DDR4 RAM 16GB (2x8GB) 3000MHz
ASUS PRIME Z370-A LGA1151 DDR4 DP HDMI DVI M.2 USB 3.1 Z370 ATX
Intel Core i7-8700K Desktop Processor 6 Cores up to 4.7GHz Turbo Unlocked LGA1151 300 Series 95W
CORSAIR AX Series, AX760, 760 Watt, 80+ Platinum Certified, Fully Modular Power Supply.

thank you

 

[Lutfij]

Welcome to the forums, newcomer!

I am considering upgrading one of my PCs for gaming and video editing.
Mentioning the titles and apps you wish to tax the build without an etc in that sentence would help us two fold in understanding what or where you're probably falling behind.

I am willing to spend between $600 and $1000. I would really like to experience the best in computer gaming, but that seems out of my reach.
I would honestly sell both builds and start anew with concurrent hardware.