It wasn't about Russian collusion.
It was about Russian interference. At least originally. But Trump, unable to deal with any hint that his election wasn't legitimate, obsessed over it and he hammered the word "collusion." Whether that was because he thought he could deflect to that, or whether it was because he was too stupid to know a better word to use, his obsession and his attempts to head the investigation off turned it into an investigation about him. And he caused the investigation to be expanded to the point that it scooped up many of his criminal associates and launched investigations in multiple courts, which will be dogging him and his family for years.
I don't expect "collusion" to be a charge arising from this. There appears to have been attempts at collusion, such as the infamous Trump Tower meeting, which fell flat. Such failures are unsurprising now that two years of the Trump presidency have shown him and his associates to be profoundly incompetent. But that's not what this investigation was about. Mueller kept his eye on the ball and has given the courts and the historians much to work with, as we have already seen in many court filings.
There is no moving on, not until all these cases work their way through court, and not until the Democrats have had as much time exposing Trump as Republicans had in providing him cover. If your side is unhappy with Democrats holding Trump Co accountable for their extreme corruption, then they can elect enough Republicans back to Congress to put a halt to Congress doing their constitutional duty.
In the meantime, buckle up, Buttercup.