A paid ad campaign that isn't performing usually isn't failing because the platform doesn't work. It's failing because of a specific, fixable setup problem. These are the ones that show up most often for local contractors and service businesses.
No negative keywords
Without negative keywords, a plumbing ad can show up for searches like "how to fix a leaky faucet myself," attracting clicks from people who were never going to hire anyone. Every one of those clicks costs money and converts at zero.
Sending clicks to the homepage
Covered in more depth elsewhere, but worth repeating here: an ad promising a specific service that lands on a generic homepage loses momentum the ad spent money building. See what is a landing page, and why does ad traffic need one?
Running ads with no way to measure results
Spending money without conversion tracking set up means there's no way to know which campaigns, keywords, or ads are actually working. It's the ad-spend equivalent of flying blind. See tracking ROI on paid ads without a marketing degree.
Targeting too broad a geographic area
A local service business advertising across an entire metro area, when it realistically only serves a 20-mile radius, pays for impressions and clicks from people it can never actually serve.
Setting it and forgetting it
A campaign left completely unattended for months, with no review of which keywords or ads are performing, tends to drift toward waste over time as costs shift and competition changes. It doesn't need daily attention, but it does need periodic review.
Competing on price in the ad copy alone
Leading with "cheapest" or "lowest price" in ad copy tends to attract the most price-sensitive, least loyal customers. Leading with speed, reliability, or a specific guarantee usually attracts a better-fit customer for most trades.
Questions
How often should I review an active campaign?
At least monthly for most small business budgets, checking which keywords and ads are actually converting versus just spending.
Is it a mistake to run a campaign indefinitely without changes?
Not inherently, if it's genuinely performing well, but "performing well" should be confirmed with actual conversion data, not assumed because it's been running a long time.
Should I write my own ad copy or hire someone?
Either can work. What matters more than who writes it is whether it avoids sounding like every competitor's ad. See how to write ad copy that doesn't sound like everyone else's.