I dont know what to do!!!!

I own a multi-niche website and for 4 months I have very big problems:
ALL my keywords were on page 1 of google in December.
Since December all my keywords cant be found in first 200 results and
every 1-3 weeks the keywords show up again on page 1 for a few days/hours and then it disappears again.

I updated my content and onpage + offpage SEO and spent hundreds of hours but it is still the same.

Maybe someone has an idea?

Maybe it is a penality... Please give more information, what you did? Maube you bought some bad links or something like that cause this won't happen without a problem.

4 months site for first page , I think you did too much un-natrurally seo work?

Sounds like it dancing then it's went ahead and got penalized.

Have you check your links manually for bad ones and removing them?

Is your hosting stable?

Going back and forth to page 1 and 200+ sounds like your hosting may be down when googlebot comes.