If you're stuck with activating there are usually 2 problems.
One a lack of a real purpose. If you haven't got a purpose you don't intend to activate.
Second problem is you're quitting too soon. Mind map, build in layers. Use the 5 day test from the book.
The sense of familiarity is different for everyone. I wouldn't struggle to get that. It's too weak in most people. School taught either / or, yes/no, Never taught anyone to tap into that sense that goes, hummm I think I know where this is heading.
Instead, keep activating for your purpose and notice what you notice. You'll learn what that sense of familiarity (hummm, I think I know where this is heading) seems like for you.
Alex
