dude, I have no idea how to do it
Please respond in a proper way when someone tries to help you.
You haven't done it properly if you don't see a difference when fans are spinning that much faster. Try to look at youtube where someone shows how to do it.
It might also be time for a clean, get a can of compressed air and blow from the rear then after from the fans so the dust gets out of place and blown out. Remember to take it out of your pc, don't do it while it's running.
Your case might also be bad ventilated, try taking the door off to your hardware and see if that make a difference.
If none of these things work, then you should contact the shop where you bought it.