Google shows images of my articles in the results, not the article itself

[hossiti]

I have a meditation music shop website with a blog, My Site's blog has about 1000 articles in psychology, health and self-development subjects, my articles are exclusively wrote and translated by our team and each article has a main image and some inline images, some main images has the article's title hard writed on them.
My problem is that many of these images shown up in a very high places in image search (with some General and irrelevant keywords like verbs! for example: doing) and gets high impressions and very low clicks. for example in a 3 months period I get 700K impressions for a keyword and just 200 clicks ! and these clicks are worthless to me because of irrelevant keywords ending up my site.
However something about 20% of my visits come from image search and arround 1% of them become costumers.
How do I tell Google that these images are not important, but the article itself and its text are?
And steer impressions in the right direction and come up in web results instead of image results?
Technically I pass most factors in pagespeed and get more than 85% score in all parts, I tried robots.txt for some images, They were removed and immediately new images from my site came up in the image results !
Thank you in advance for your guidance.