...the value of STEEM is very low, because many users are discouraged and leave the platform (or significantly decrease the interaction time)

Leaving-Users vs Less-Interaction
I tend to think (or at least I cheer for it 😁) that the second option would be the case. I guess that Steemit is yet (till now...) a geek oriented platform and while in holidays geeks don't send pictures of their feet from the deckchairs or views of cool and luxury holiday places. They simply take a break, a break from they online core tasks. So stay tuned and ready for an hot autumn and winter! :)