Somebody has read enough of your site to want to talk to you. They scroll to the form and find nine fields, three of them required, one of them a dropdown asking what their budget is. Quite a few of them close the tab there, and you never see it happen, because an abandoned form leaves no record of the person who abandoned it.
To start a conversation you need three things. Their name. One way to reach them. Some idea of what they want. Everything else on that form is a question you could ask in your reply, when you already have their attention and they are talking to a person instead of filling in a grid.
The budget dropdown deserves singling out. It is meant to filter out people who cannot afford you, and it does, along with most of the people who simply do not know yet. A business owner who has never commissioned a website has no idea whether their project is fifty thousand rupees or five lakh, and asking them to guess in public makes them feel foolish. The ones who answer confidently are usually the ones who have already had three quotes.
How did you hear about us belongs in your analytics, not in the form. If you cannot answer that question from the data you already collect, the fix is your tracking, not another dropdown for the customer to fill in.
Requiring a phone number is the other common mistake. Plenty of people will type an email address into a form at eleven at night and will not hand over a phone number to a company they have not spoken to. Make it optional and watch what happens to completions.
One field worth keeping and improving: the message box. Most of them say Message, which produces a sentence like “Interested in your services, please call.” Put a real question in the placeholder instead, something like “What are you trying to fix?” You will get an answer you can actually price.
There is a real case against all of this. If you are drowning in junk enquiries, extra fields work as a filter, and a filter that costs you a few genuine leads may still be worth it to get your afternoons back. That is a trade worth making deliberately rather than by accident, which is how most nine-field forms came to exist.
The way to find out is cheap. Count your fields. Note your submissions for a month. Remove one field, wait a month, look again. Nobody needs a testing tool for this, and the numbers are usually obvious enough that you will stop before you run out of fields to cut.