Revolution (or whatever it was he was doing; resistance, rebellion, reformation, ruminating, rotting) was slow business, especially as the work for the RR was still mostly in establishing and insinuating themselves into the world. Fred's itchiness to do things was tempered (usually) by the knowledge that they needed to build, to stay in the national consciousness without alienating people needlessly. He was better at it than he'd been when he and Georgie were building the business, but a business and a resistance movement had just as many differences as similarities. Honestly, the leadership would have been easier if he could just exist normally, but the fact that he couldn't exist normally is exactly why he needed to be in a position of leadership.
Anyway, he was lucky; he had Tonks and the slowly growing RR to spread out what had initially been just one bloke railing against the Ministry, he had the inhabitants of 93, he had family who were keeping his secret for him. All up, he was probably in the best position of any of the reoccurred to be doing what he was doing, in all respects.
That didn't keep him from going a little stir crazy.
The invisibility cloak was a revelation and probably up there with the initial investment in them when it came to 'things I'm grateful to Harry for'. The degree of freedom it granted him helped his mental state out considerably, and he could wander and be in a crowd again without having to endure the taste of polyjuice. Sometimes he didn't really do anything, just stood by the side and people watched. Today had been one such day, except-
He'd spotted Billiam, sprog in tow (that was definitely his sprog), making his way into Flourish & Blotts. It was too good an opportunity to pass up and, obscured underneath the safety of the cloak, he followed another customer in through the open door, neatly weaving his way between stacks of shelves and people. Bill's son had gone off to some corner by himself, and Bill was looking at the most boring shelf he could have found. 'Discipline and Schedules for the Young Wizard' popped out to him, and making an (invisible) face to himself, Fred reached out and neatly pulled the book off the shelf, letting it drop to the floor where it belonged.