The instinct when Meta is not working is to add more: another campaign, another ad set, another audience. It feels like control. What it actually does is split one working signal into five weak ones that compete with each other.
Your ad sets are bidding against you
When several of your ad sets target overlapping audiences, they enter the same auctions for the same people. Meta will not bid against itself, so it suppresses one and picks another. That is auction overlap, and the result is wasted budget and a delivery system quietly throttling half of what you built.
Fragmented signal never learns
Each ad set needs a threshold of conversions per week to exit the learning phase. Split your budget five ways and none of them clears it, so all five stay stuck in learning, volatile and expensive. One campaign that concentrates the conversions learns; five that divide them do not.
Consolidate, then let the budget flow
Fewer, broader ad sets under Advantage+ campaign budget (formerly campaign budget optimization) let Meta move spend to whatever is working, instead of you guessing the split. Check the audience overlap tool before launch, and when you see the same audience carved across ad sets, merge them. More campaigns is not more reach when they fish the same pond.
Common questions
Is it better to have one Meta campaign or many?
Usually fewer. Multiple campaigns targeting overlapping audiences compete in the same auctions, so Meta suppresses some, and splitting budget keeps each ad set below the learning-phase threshold. Consolidating concentrates signal and spend.
How do I know if my ad sets overlap?
Use Meta's audience overlap tool, and watch for ad sets stuck in learning and costs rising as you add more of them. Overlapping targeting is the usual cause.