So leave them there. There is also an option to "restore the previous session", or something like that. The browser will only load page shortcuts, so it won't eat much memory. And your browser will be like a bookshelf - the mood appears, take a book and open it. I have it for three years, I just got used to some, it's nice that they are ^^
In addition, if you don't want to stuff bookmarks, then you can stupidly export to html. That is, "add all tabs to bookmarks" -> export -> erase bookmarks. This is on a PC, I don’t know how on Andrew, it should also be.
You can go to the link https://myactivity.google.com
There is filtration on the page: select the filters you need (by date, by a specific application). On the left in the side menu, select Show actions (so as not to miss the blocks and to be more visual). You will see all the tabs that were once open, but provided that you are using the native chrome google browser, and not a third-party one. At least write what kind of browser is used on smart, I'm not a telepath, if that. So the simplest solution was described by default.