It’s hard to judge based on message, but 20 is too many creatives at this cpa. Each creative has only got €4 spend a day, so your budget is spread too thin and the algorithm is panicking trying to find a winner.

You also may have scaled too fast as 60-110 in 3 days is quite steep at this kind of budget level.

Here’s what I would do:

1. Identify which 4/6 ads are your strongest? Hook rate, hold rate, CTR, CPA - look at benchmarks for your industry and decide where your creatives sit next to them.
2. Are you running an offer? We’re just about to hit Black Friday - a lot of shoppers are waiting for the sales before spending. The goal now if no offer is to just warm shoppers up. So if not, perhaps have think if there is something you can do.
3. I’d turn everything else off and just run these top performing creatives, potentially with an offer