Nobody stops paid because it stopped working. They stop because it stopped working economically, and those are different things. Here are the signals worth acting on.
Rising CAC at flat conversion rates
If your cost per acquisition climbs while landing page conversion holds steady, you are paying more for the same quality of traffic. That is auction pressure, not a creative problem, and no amount of ad testing fixes it.
The correction people reach for is new creative. Do that once. If CAC keeps climbing with conversion flat, the channel has repriced and you should be moving budget rather than iterating.
Frequency climbing in a fixed audience
If you sell to a defined segment, say clinic owners in Maharashtra, the audience is finite. Watch average frequency. Past a certain point you are showing the same ad to the same people repeatedly, and incremental spend buys annoyance.
Branded search doing the work
If a growing share of conversions come from people searching your brand name, your paid spend is capturing demand created elsewhere rather than creating it. Useful to know and easy to miss, because those conversions look like paid wins in the dashboard.
Test it by pausing branded search for two weeks and measuring total conversions rather than paid conversions. Many Indian teams find most of that traffic arrives anyway.
Payback longer than your runway
If CAC payback runs eighteen months and you have twelve months of cash, paid is not a growth channel for you, it is a liability. This is arithmetic rather than strategy.
What to do with the budget
Do not move it all at once. Content takes a year to work and cutting paid to zero creates a gap you cannot fill. Shift twenty to thirty percent, hold it there for two quarters, and watch blended CAC rather than either channel alone.
Put the shifted budget into the content types that earn links rather than more posts. One original research piece will do more for organic than twelve explainers, and twelve explainers is roughly what the same money buys.