What kind of treatment would be good to get at a dermatology clinic when my face looks dull?

I do take care of my skin to some extent, so I do face masks at home.

I get massages and do all sorts of things, but the dullness of my face

It's not going away.

I also bought and tried the vitamin serum, and it improved just a little bit.

degree?

I think I need to go to a dermatologist and use a machine.

I'm afraid I'll get ripped off if I go to the dermatologist without any information.

I'm planning to check it out in advance.

Are there any members who went to a dermatologist for brightening effects?

I would appreciate it if you could let me know of a procedure I’ve seen often!