Think you're looking at 3-4 more veteran FA additions--
Defense line is a must... Ideally, they should add another veteran edge rusher for depth and an iDL who can be your starter going into the year... Because of cost and need, I see iDL being prioritized as someone they would be willing to spend for as opposed to the veteran edge rusher being a one year minimum type deal.. Shelby Harris, Calais Campbell, Poona Ford and Matt Ioannidis would be the guys who could come in and start right away... Campbell doesn't seem to be on the Browns radar while Ioannidis seems like the ideal fit... I do wonder if they'll sniff around Mario Edwards or Suh, who was actually solid in his Eagles stint, given their Schwartz connection...
The veteran edge market is flush with options so I feel confident they'll be able to bring in someone for competition... Justin Houston and Carlos Dunlap would be at the top of my list but you have all of the following still out there: Ngakoue, Frank Clark, Melvin Ingram, Markus Golden, Leonard Floyd, JPP, Shaq Lawson, Bud Dupree, Robert Quinn, Trey Flowers, etc... There's not seats for all of them and Browns should be able to get at least one for a one-year minimum deal..
Safety is another position that falls in line with edge: While they've addressed it in FA, the depth is concerning and I don't think you fully solve either with a rookie... I would have been happy with Harman or McLeod as a starter so if they could get either to be S3, that would be ideal... Otherwise, Andrew Adams and Joshua Kalu have connections to Schwartz while Logan Ryan, Adrian Amos and Landon Collins are all bigger name guys that can still play...
Running back would be the other position I expect them to add a veteran at some point... I expect them to draft a RB too but the depth behind Chubb is Ford, John Kelly, Demetric Felton (who has been working as a WR this offseason) and that's it... RB is the least concerning of the positions given the ease of plugging a guy in, the ease in finding a guy (there will always be a serviceable vet available) and I do wonder if the Browns may elect to go with 7 WRs and 3 RBs given the roster balance right now... If they don't sign one in March/April, I would expect a veteran addition closer to camp... Jerick McKinnon, Rex Burkhead, JD McKissic and Giovani Bernard would all be guys who could fill that 3rd down role vacated by Hunt, and give Ford some competition...
How I'd rank them--
1). iDL
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2). S
3). EDGE
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4). RB