Legit #1 Norris caliber D-man: Nemec is hopefully that guy. Hamilton is the placeholder in the meantime. This isn't a position that you can just trade for without completely dismantling your existing team in return.
Legit sniper: you can possibly acquire one as a rental, but would that move the needle enough this year to be worth whatever the cost would be? Guess it depends on the price.
At least one (maybe two) bigger versatile physical players who can slot into the top 6 if necessary to help the team win if/when our speed game gets neutralized (and also for the playoffs): this can possibly be addressed via trades both at the deadline and otherwise, but again depends on the price. Do we have anyone in the system that's not already on the big club that can fill the role?
Goaltending: jury is still out on if what we have is sufficient. I think with the right team play in front of them, average goalies may be good enough (see the 2022 Stanley Cup champions).