I want to keep the settings except emission and only change the strength of it like the emission node. Any ways?
You can manually input values higher than 1 in the red,green,blue fields of the emission color of the principled shader. Keep in mind that this is a workaround and will not mimic exactly how a classic emission shader works when you tweak its strength.
For ease of use you can use such a setup : Add an rgb node in order to input the exact color you want the emission to be, a value node for the strength of the emission, and link both of them to the color inputs of a mix rgb node set to multiply with a factor of 1, then set the output of the mix rgb to the emission input of the bsdf.