Most likely your faithful assistant has started to act up in games and the former comfort is no longer there. First, you need to determine what exactly in your computer is outdated.
To upgrade your hardware, start by assessing your old computer to understand exactly what needs to be replaced. And before conducting tests, make sure all PC components are working properly.
All about cooling installation in an article by HYPERPC: how to replace the CPU and GPU cooler, how to properly install water cooling, how to replace cooling in a laptop.
Everything about installing and replacing an SSD drive in the article from HYPERPC: connecting, replacing HDD with SSD, which cables are needed for connection, installing mSATA, PCI-e, NVME, how to transfer the system to SSD.
All about thermal paste in HYPERPC's article: how to properly apply and replace it, how often to change the thermal paste, replacing thermal pads, applying liquid metal, and how many grams of thermal paste to apply to the CPU and GPU.
All about installing and replacing a graphics card in an article by HYPERPC: replacement, correct installation of AMD and GeForce graphics cards, how to install a second graphics card, what cables are needed, and whether it is possible to replace a built-in graphics card.
Processor is one of the main components of a computer, which, along with the graphics card, determines its power and affects what games you can run and with what settings.