QB may or may not be a priority. Where the Rams sit in the draft (late 2nd round), if they are seriously thinking they want to move on from Goff, they need go after Florida's Trask who will probably land right at the end of round 1 or beginning of round 2.
But assuming the organization is satisfied at QB, a deep threat WR is greatly needed. Not just anybody, or not just a big body. Rather a true, good hands, good moves, serious deep speed WR that has that mentality. A guy that the secondary fears can run past them. Kupp and Woods are not deep threats and neither is Jefferson and the lack of that has hurt the Rams passing game.
Next in line is probably Dline. I think we'll be losing Fox and Floyd. AT DB I suspect they'll tender D. Williams with a 2nd round tender. But the guy is so darn good someone just might pay the price. So depending on what happens here, DB might be in play.