So, @Pvzero is using the Turkish language with his question. Using Google Translate I get:
i have ryzen 5 5500 but when i open the game the mhz never reach 4250 how do i solve it
I think the first thing we need to know is what his system specs are, such as the motherboard, the RAM, the PSU, the video card, the CPU cooler and the monitor. Then we need to ask if he has updated his motherboard BIOS to the latest version. After that, what are the CPU and GPU temperatures running at? Maybe his Ryzen 5 5500 is thermal throttling due to excessive heat. Maybe there is a BIOS setting that is wrong.
As Albert Einstein said, "I could have done so much more with a Big Al's Computer!".