Yeah, they can still do something big. Though there aren't a lot of big moves to be made still. Might be some good players later that other teams need to move. Still some good safeties out there, but the Vikings have been good at developing their own. I also wouldn't mind another LB who can play coverage. The defense really struggled with Pace was forced to do it all. I don't know their pass coverage grades, but Kyzer White and EJ Speed look like upgrades. Probably also have to think about LT in case Darrisaw is slow to get back up to speed. That's probably a spot you have to wait on though. Can't just pay a starting LT backup money.
I'm not sure about Kupp, or any other big name WR though. I'm thinking you'll end up with a Jordan Addison problem if you do. I could see this as his last year in Minnesota, as I'm not sure you give him a big contract, but I'd still rather have him than an aging Kupp or Amari Cooper this year.