I really need advice

I am advertising since may 2025. I sell a self made niche product in the fitness branche. Something strange is happening since this year. After Christmas I turned off the campaign for more than 7 days.

Every campaign I launched after that, fails. So almost no atc or sales. I didn’t changed anything on my website. So I don’t think it has something to do with the offer.

So far I got 2 sales with one campaign (with interest based targeting).
Normally my budget is around €50, but now it‘s €30. Before I would get around 2 sales with a budget of €30. I know this isn’t much, but it worked for me.
Cpc and ctr are okay.