Welcome to the forums, newcomer!
You don't need thermal paste. You should look into the Ryzen 5000 series of processors, instead of the 3000, in 2023. Up the PSU wattage, keeping the quality of the unit the same.
You know what? How about you stylize your post with info asked of in this therad;
If you're looking for advice, the best way to get it is by providing as much information as possible right from the start. This allows other readers the context they need to point you in the right direction. Here are some suggestions to improve your chances of getting solid answers: What should...
forums.pcgamer.com
and we can move forward with suggestions.