Traffic is rarely the hard part. The hard part is that most people who already visit leave without making contact, and nobody knows why.
Four stages, and a leak at any one wastes everything spent on the stages before it:
Most money goes into stage one. Most losses happen in two, three and four — and those are cheaper to fix.
The structural side of this is user experience design.
A business notices form submissions have stopped. Not slowed — stopped. A mail setting changed months ago and every submission since has silently failed. They were paying for traffic the entire time.
Storing submissions as records as well as emailing them means the lead survives even when delivery fails. Add an alert when a day passes with none, and it becomes impossible to miss for long. Checking this is part of ongoing updates and edits.
A lead arriving is not a lead handled. Worth having happen without anyone remembering: an immediate acknowledgement to the customer, an instant alert to you, assignment to the right person, and a follow-up if nobody responded within a set window.
The follow-up on quotes that went quiet is usually the highest-value piece, because it's the step most businesses skip.
Visits aren't the number. Calls started from the site, forms submitted and from which pages, and what share of visitors do either. Setting that up is analytics and reporting. Without it you'll usually conclude you need more traffic when you need a better page. And traffic itself comes from Google search optimization.
Describe what your business needs and you will get an honest read on what would actually help.