How to Cut Your CAC by 30% in 90 Days With Multi-Platform Paid Ads
Customer acquisition cost is the number that determines whether your business is viable. Every other metric is downstream of it. In 90 days of running campaigns across Meta, Google, TikTok and Reddit simultaneously, we've consistently brought CAC down by 25–40%. Not by cutting spend, but by spending smarter. This is the playbook we use.
1. Start with a two-week baseline sprint
Before you optimise anything, you need clean data on what's actually driving conversions right now. Run your current campaigns for two weeks without changes. Just track. Record cost-per-click, cost-per-lead, cost-per-trial and cost-per-paying-customer for every channel and every ad set. This baseline is your reference point for everything that follows.
The mistake most teams make is launching optimisation changes before they have a baseline. You end up optimising against noise, not signal.
2. Eliminate the ghost channels fast
Most multi-platform campaigns have one or two channels doing real work and two or three others burning budget on impressions that never convert. Your baseline sprint should expose this clearly. Be ruthless: if a channel isn't producing cost-per-conversion within 150% of your target after two weeks, pause it and reallocate to what's working.
Common culprits: display campaigns with broad targeting, YouTube bumper ads for products that need explanation, and cold Telegram campaigns without a warm community to back them up.
3. Creative is your biggest lever. Not audience
Most marketers spend 80% of their time on audience targeting and 20% on creative. The data from our campaigns tells us this is backwards. On Meta and TikTok, creative variance accounts for a significantly larger proportion of performance difference between ad sets than audience targeting. A fresh hook can cut CPC by 30% overnight. Changing an audience usually moves it by 5–10%.
The practical implication: run 3–5 creative variants per channel simultaneously. Test different hooks (first 3 seconds of video, headline of a static), not just different images of the same concept. Kill the bottom two performers after 72 hours of data and replace them with new variants.
4. Layer your audiences, don't just stack them
Running cold audiences alongside retargeting audiences in the same campaign creates budget competition and inflated CPMs. Separate cold, warm and hot audiences into distinct campaigns with distinct creative and distinct bid strategies.
Cold: broad or interest-based targeting, awareness-stage creative, optimised for landing page views or video watches. Warm: site visitors, video viewers, engagement audiences, optimised for sign-ups or trials. Hot: cart abandoners, trial users, email list, optimised for purchase or upgrade.
5. Use Reddit to lower average CPL
Reddit is consistently under-used by performance marketers and consistently over-delivers on intent. Subreddit targeting puts your ad in front of people who are actively discussing the exact problem your product solves. CPMs are lower than Meta. Conversion intent is high.
The catch: Reddit creative needs to not look like an ad. Text-heavy posts, genuine opinions and community-style language outperform polished creative. Treat it as a separate creative workstream.
Bringing it together
Month one: run the baseline sprint, eliminate ghost channels, start creative testing. Month two: layer audiences, implement Reddit, align ad-to-landing-page messaging. Month three: cohort analysis, shift budget to highest-LTV channels, automate the optimisation process with rules.
Three months of disciplined execution. Not tool changes, not new platforms, just fundamentals applied consistently. Is what gets you to a 30% CAC reduction.
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