Since you mentioned creative, are you talking spend on Meta?
There should not be a huge funnel or campaign change to go from $3K per month and past $10K per month. You should be able to run with just one ad campaign at your spend level. You don’t need anything fancy of some secret sauce (there are none). If you are increasing your ad spend and it is not working then whoever is running ads has not found a profitable ad to keep running.
If something is working on Meta, you should be able to spend $300 per day on it without it breaking. So either the ad was never a winning ad and or you are looking at the wrong data to judge success. e.g. you are just looking in Meta’s ad manager and using view-through and modeled conversion data to judge success, which is how a lot of brands burn money on the ad platform.
If you want to spend more money, you need to find a winning ad that is driving real revenue into the business. We use a combination of GA4 data and ad manager data to find what is working and put more ad spend behind the winners. Anything else gets cut and we create new creative to replace what we paused.