Google Impressions dropped since January without changes, what to do?

I started a small website last year in around September, it was starting to get many impressions around December and then suddenly drop at the start of January, without any changes in the website layout, design or content.

The avg. position is always the same and also the conversion rate is always around 1%, but as you can see the impression really took a hit.

The keywords should always have the same "popularity" so that shouldn't influence it. I don't actively build backlinks so also that shouldn't influence it.

Now I've read that an update is coming an Web Vitals will be part of the algorithm, which my website is pretty good respect of the other competing websites, so hopefully that will do something.

Any suggestion or idea on what the cause could be?