A contact form is one step in a longer conversation. To review yours, start where a new customer would start: the home page, a service page or a link on a business profile. Can you find the right way to ask for help without knowing how the business is organised?
Use a clearly labelled test enquiry. Try it from a phone, read every field label and notice what happens when something is missing. After submitting, check the confirmation on the website and whether the message reaches the intended inbox. If an acknowledgement is promised, check that too.
Then follow the handover. Who notices the enquiry, who replies, and where is the outcome recorded? A form that sends successfully can still leave work waiting in an inbox nobody owns.
Write down the first point where the next step becomes unclear. Fixing that one handover may be a more useful starting project than changing the whole website.