Nothing happens the day you stop. That is the good news and the trap, because the bill for stopping arrives late and it never says what it is for.
A new site does not start where the old one left off unless somebody made sure it would. When traffic falls after a launch, the reason is almost always in the addresses, not in the design.
The number on the quote is the least useful thing about it. What matters is what will physically get done, and whether that is capable of paying for itself in your business.
Pride only hurts. It never helps. The honest answer is that you can do more of this yourself than anyone selling you SEO will admit, and the thing that stops most owners is not the work at all.
Search your company name. There you are, first, exactly where you should be. Now search the thing you actually do for a living, and watch yourself disappear. Those two searches are not the same contest.
It lands on the first of the month. Twelve pages, four charts, a healthy number of green arrows. You read it on your phone in the truck, feel vaguely reassured, and could not tell anybody what it said.
Type your own trade and your own town into your own phone. Count how far down the page you get before you hit a business instead of a list. That gap is where your next customer goes.
Somebody searches the thing you do, and Google hands them your About page, or a blog post from 2019, or the wrong town. The page you built for that search is nowhere. Here is why that happens and how to fix it.
One page for every genuinely different thing you sell, do, serve or get asked about. For some businesses that is a dozen. For others it is thousands. What it is never is the same page written four ways.
You were on page one last month. Today you are somewhere below a directory, two competitors and a man selling the same thing out of his truck. Before you touch a single page, find out when it happened.
You typed it in yourself this morning, on your own computer, in your own office, and there you were. Third. Except nobody else on earth is seeing that.
You opened this year. They have been online since before the iPhone. Here is the part nobody tells you: you are not supposed to fight them yet.