Keeping a close eye on search terms daily is still the one thing I refuse to outsource or automate completely. The platform changes we've seen over the years - broad match getting smarter, phrase match essentially dissolving into close variant chaos, automatic bidding taking control - none of that actually eliminates garbage traffic. It just hides it better.
What consistently works for me:
Daily or every-other-day search term audits - not just skimming the list, but actually opening the full report, sorting by spend, and hunting for queries that trigger irrelevant impressions. This catches the "false positives" from broad match and phrase match that can run up spend before your negative keyword list catches up.
Aggressive negative keyword building from day one - every new campaign gets a base list of negatives from competitor terms, unrelated modifiers, and low-intent phrases. Then I add to it from search terms every session. Over a few months, you build a custom shield that keeps the algo's smarter matching from wandering off track.
Segmenting by match type in the report - I'll look at exact match, phrase, and broad separately. Exact match still throws up weird close variants (e.g., "cheap [product]" when you only sell premium). Those get negated too. Broad match is a firehose - you need daily maintenance there or you'll waste budget on "what is [product]" type queries.
Using the "add as negative keyword" button in bulk - select 5-10 irrelevant terms at a time, add them as exact match negatives. Over a few weeks, the account's click-through rate improves because you're no longer showing for nonsense.
The long-term payoff is that your quality score stabilises, your impression share on meaningful queries goes up, and you don't wake up to a surprise budget blowout. It's not glamorous, but it scales. I've seen accounts where search term negligence resulted in 30-40% of spend going to irrelevant traffic after just two weeks of ignoring the report.
One more thing: set a filter to show only terms that have spent above £X (whatever your threshold is) and with X+ clicks. That keeps you from getting lost in long-tail noise. Review the low-impression terms weekly instead.
The platform's matching logic keeps evolving, but the manual check still catches what the algorithms miss.
