Don't listen to him lol deathstroke's sword flip is really unsafe and his keepaway has been nerfed to the point where any character can get in with no effort.If you want i could show you all i know and what i see in good deathstroke players
Most of his combos end with 323 f23 sword flip or 323 12 sword flip. If you end with 12 sword flip midscreen, you can dash up twice and get a b1u2 or b2 mix-up. Ending with f23 sword flip adds 1% more but they can backdash/jump out of your mix-up afterwards. So I usually end with f23 sword flip in the corner.
Midscreen: 132 j2 323 f23 sword flip b1u2 f3 323 f23 sword flip f3 1 323 f23 sword flip MB b3 j3 j2 323 f23 sword flip (hit the j3 low to the ground) j3 323 f23 sword flip d2 (f3) 323 f23 sword flip (the f3 is optional, depends on how well you can hit confirm) (anti-air) d2 b3 j3 323 12 sword flip (air-to-air) j1 d2 b3 j3 323 12 sword flip d1/b22 MB sword spin dash sword flip
Corner: 132 1 323 f23 sword flip j3 323 MB sword spin 323 12 sword flip d1/b22 MB sword spin 323 f23 sword flip d1/b22 MB sword spin dash MB sword spin 323 f23 sword flip (if you're 2 dashes away from the corner) MB b3 jump back 3 1 323 f23 sword flip b1u2 and f3 combos are the same as midscreen
There are some more combos such as side-switch, corner carry and setup combos but the ones listed above are the basics.