If your analytics shows people arriving and your inbox stays empty, the problem is rarely the amount of traffic. It is that the page gives a visitor no obvious, low-cost next step at the moment they are actually convinced. Piling more traffic on top of that just means more people leaving.
You can usually find the cause in ten minutes. Open your homepage as a stranger with thirty seconds and ask three questions. Can I tell what you do and who it is for, in one line, without scrolling. Is there one clear thing to do next. Does doing it feel cheap, or does it demand a call and a form full of fields before I have decided anything. Whichever answer is "no" is your problem, and usually it is only one of them.
The common culprits are simple. The page never says plainly what you do, so a visitor cannot tell in five seconds whether they are in the right place. Or the only way to reach you is a long form that asks for too much too early. Or the one thing you want them to do is buried under three scrolls of good-looking sections that say very little.
So what is a good next step. Something specific and cheap to take. "Start a project" or "Get a rough quote" beats "Contact us", because it names what happens next. Offer the smallest commitment that still moves things forward: a short message, a call booking, a price guide to download. The action should cost the visitor almost nothing.
And how much should a form ask. As little as you need to reply. A name, a way to reach them, and a line about what they want is plenty to start a real conversation. Every extra required field costs you responses, so ask for detail once someone has replied, not before. A contact form is a door, not an application.
When you change something, change one thing at a time so you know what worked. Rewrite the headline to say plainly what you do, or cut the form to three fields, then watch enquiries for a couple of weeks. If your traffic is low you will not get clean numbers quickly, so also judge by whether the page is clearer to a real person, not only by the chart.
Two quiet killers are worth ruling out while you are in there: a page that is slow to load on a phone, and a layout where the one action sits below the fold on mobile. Most of your visitors are on a phone. If the page takes several seconds to appear or the button is buried, you lose people before the words ever matter.
Before you spend more on ads, fix the page a convinced visitor lands on. Say what you do in one line, give one cheap next step, and get out of the way. That is the cheapest lead you will ever buy.