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For a book layout, I'd recommend using Primary Text frames on the master pages, and then flow the text into each chapter. This way, you can modify frame size and position on the master pages, and all the text reflows on the body pages.
If you didn't design your book with primary text frames and if you are using InDesign's Alternate Layout feature and then wish the frames will reflow, you need to set up liquid layout rules prior to creating the Alternate layout to get the same result.
If you are past these options, you could create a new, correctly-sized document and reflow the text in the current file into the new one. Use primary frames this time, just in case something else changes. You can load styles from one file to another.
This does not help because I would need to select all frames separately and they cannot be moved to the left or right by a set length such as 1 or 2 mm when a new layout is created.
I cannot also reflow the text as frames in my document have different sizes and when I reflow the text all frames will have the same size.
But trying your solutions I found the one that works. I just did not know that I can manually change the size of a document in master pages layouts. So I just selected the page tool and then picked the border of a page and moved it to the left or right. Each border manually, the left, the top and so on. 1mm, 0,5 mm whatever I want. And it works for all pages with this layout.
When I had tried before to resize the document or create an alternate layout and I typed the number, for example 206 mm in page width, pages were cut automatically and on a wrong side of a paper what was not my intention.
So the topic is ANSWERED by me
Books normally use the same sized frame on every page. We haven't seen your layout, so we can't be more specific. But from what you have told us, you did not design this document expecting a major layout change (by using primary frames or setting up liquid layout rules as you went) so there is not an easy answer to your dilemma.
One of the important lessons I try to convert to every InDesign student is to design as if you are expecting a major last-minute change, and prepare for it. It's too late this time, but something to consider as you move forward to new projects. It's a lesson many of us learned the hard way, so you are in good company.