Ahrefs, Robots.txt and Hard down in Google

Hello People,

I hope anyone could help me :

For two months, I spend few hours per week to build a little lifestyle blog (40 articles).

No AI, no Ads, no affiliate link, no duplicate content, no stealing, and I have a good exp and level in web/SEO in general.

Four days ago, while I was growing, I got a huge, incomprehensible strike : from between 1500/2500 impressions for 50/80 clics per day to 100 impressions for 3/5 clics.

I can't see any problem in the GSC, and no more where I try to find it else :

- Page Index are "OK"

- Sitemap OK

- HTPPS : OK / Core Web Vitals : Full Good / Breadcrumbs : Full good

- Manual Action or Security Problem : OK

- Links : OK (nothing to disallow)

- Google bot is still exploring the website a lot (between 300 to 400 per day)

Offsite, I have good signals : social network sending trafic, organic backlink (from forums), a little Youtube account linked with one video who do some views...

I cant found ANY FKCNG PROBLEM...!

The only thing I found is from Ahrefs : His crawl audit says me that my Robots.txt isnt accessible, and he cant access to my URL for twenty days (I have auto report). For example :

- 3 january : 347 URL crawled (including images) / Health Score : 95%

- 17 january : 413 URL crawled / Health Score : 74%

- 24 jan : 2 URL crawled / Health Score : 0%

- 31 jan : 2 URL crawled / Health Score : 0%

- yesterday : 2 URL crawled / Health Score : 0%

- today : 2 URL crawled / Health Score : 0%

But from my point of view, I can't see any technical problem, and I can't more understand where Ahrefs found a crawl problem than why Google erase my website from SERP. The site is accessible, Robots.txt too...

If I could, I would have shared even more telling screenshots with you, of course.

Could anyone has an idea ?

PLEASE HELP ME

('>_<,)

thanks for reading