How will page positions change after content changes?

Question

Search Engine Optimization

How will PSs react to content changes on the page? That is, there is a page with the text of 1000-1500 thousand with 1-2 short circuits. The page in the Yandex index is 24th position, in Google 5th position. After analyzing the output, there was an understanding that it is necessary to increase the text, add the exact occurrence of a short circuit, a blurry occurrence of a short circuit, words amplifiers.
If you change the content according to the analysis of competitors, then how can the position of the page change? Will it get worse or should it still grow?

Answer 1

They can get worse, they can grow, the search engine is a black box for everyone, no one knows how it works exactly, everything is learned through experiments