We have a website with about 8 million pages
https://www.tibrains.com/
We try to index it, but have not very good results
We had about 13-14 000 indexed pages for the last several months
Then Google indexed about 100 000 pages in 2 weeks
Then 2 weeks we stayed on the same level
Then Google indexed 25 000 pages
And then we again have no results for 2 weeks
I attached the screenshot
Also, the crawl rate is very low... Only several time the crawl rate was high enough
With such a speed it will take about 25 years to index all the pages of our site
Is there any way we can speed up this process?