I have little fps in minecraft despite good pc and I've already tried everything
Which component are in your PC or laptop? If they are too bad, you can try everything, nothing will help.
16gb ddr4 ram
GIGABYTE GTX 1080 Ti Gaming OC Black 11G graphics card
1tb ssd
Java 64 bit installed?
Allocated enough RAM?
Yes, I already have everything
Then reinstall Minecraft. How much RAM did you allocate? What is in the Java arguments?