The Difficulty-Under-20 Rule and How I Actually Apply It
If you are asking how to find low competition keywords for a new site, the answer is not a tool. It is a threshold. I only target keywords under 20 difficulty score until my domain has earned the right to go higher. That is the whole rule. Everything else is detail.
The short answer
Keyword Difficulty under 20, checked weekly for the first 90 days. I run this on every new site I touch, whether it is a DTC brand starting from zero or a content play I am building on the side. The reason is simple math. A brand new domain has no backlinks, no age, no trust signals. Google is not going to rank you above sites that have all three, no matter how good your content is. Difficulty scores above 20 almost always mean you are competing against domains with real authority. Under 20 means the field is either thin, badly written, or full of sites as new as yours. That is where you can actually win.
What changes the timing
The number 20 is not fixed forever. A few things move it up or down.
- Your niche's overall competitiveness. In finance or health, even a difficulty of 15 might be optimistic for month one. In a narrow B2B niche, you can sometimes push to 25-30 and still win.
- Domain age. Once a site passes six months and has 10-15 quality backlinks, I raise the ceiling to 30. By month twelve, with consistent publishing, 40 is fair game.
- Content format fit. Keywords where the top results are thin listicles or outdated forum threads are softer than the difficulty score suggests. I have ranked page one for a "22 difficulty" term in nine days because the top five results were all five years old.
- Your linking capacity. If you have a real PR or outreach engine, like I did running comms on a $2.2B infrastructure project, you can absorb higher difficulty because you can generate authority faster than organic growth alone.
Signs you are overdue
Some signs tell you it is time to raise your own difficulty ceiling and stop hiding under 20.
- You have ranked for 8-10 keywords under 20 difficulty and they are holding steady in positions 1-5 for at least 30 days.
- Ahrefs or Semrush shows your Domain Rating has crossed 15-20.
- You have earned backlinks from at least 3-5 domains with DR 30+, not from directories or guest post farms.
- Your organic traffic has grown for three consecutive months without a plateau.
When you see two or more of these, you are ready to test keywords in the 25-35 range. Staying under 20 forever just leaves growth on the table.
What happens if you wait too long
I have seen founders get so comfortable with easy wins that they never graduate. A DTC brand I ran hit $100K in revenue partly on the back of a dozen low-difficulty blog posts about product use cases. Good start. But the founder wanted to keep grinding out sub-20 keywords for another year instead of going after the 30-40 range once we had backlinks from a few relevant blogs and one decent press mention.
The cost was real. Competitors with less product knowledge but more nerve moved into the mid-difficulty keywords we should have owned. By the time we shifted strategy, it took four extra months to catch up because those competitors had a head start on backlinks and content depth. Waiting too long is not safe. It is just slower failure with better vibes.
On the flip side, jumping too early costs you too. I have watched teams burn three months of content budget chasing difficulty-40 terms with a domain that was six weeks old. Zero rankings. Zero traffic. Money spent on content nobody found. The rule exists because both mistakes, waiting forever and jumping too soon, are expensive in different currencies.
The most common mistake
People check difficulty once and never again. They pull a keyword list in week one, decide it is all under 20, and build a content calendar for six months around that single snapshot. Difficulty scores shift as competitors publish new content and as Google's algorithm updates roll through. I recheck my target list every single week for the first three months of a new site. It takes fifteen minutes. Skipping it means you are optimizing for a competitive landscape that no longer exists.
The second version of this mistake is treating difficulty score as gospel instead of a proxy. The number is an estimate based on backlink profiles of ranking pages. It says nothing about content quality, search intent match, or how outdated the top results are. I always eyeball the actual top 10 results before trusting the score. A 25 with weak content beats a 15 with strong content every time.
Practical takeaway: pick your under-20 keywords this week, publish against them, and set a calendar reminder to recheck difficulty scores every seven days for the first 90 days. When you hit three or more of the "overdue" signs, raise your ceiling to 30 and keep moving. Do not wait for permission from a tool. Wait for evidence from your own rankings.