What are the penalties for not opening the site?

Question

Search Engine Optimization

The last 5-6 months the site did not work for about 30 minutes 5-6 times. The last time, a few days ago, was also such a case. There were ~2000 visitors from Yandex per day, and after that it dropped to ~400. The number of indexed pages has also fallen, but not as much.

• Is this period forever?
  
• Or will a certain amount of time pass and everything will return to its place?
  
• What can be done to remedy the situation?
  

If there are useful links where you can read about it - please share.

Answer 1

Stupidly, the site is washed out of the index due to the inaccessibility of the spider.
If you improve the work of the site, then usually everything returns to normal