(Assuming 6 problems in Div2 and 6 problems in Div1 with no subtasks)
How to become Expert: Solve up to D in Div2 or solve up to B in Div1
How to become CM: Keep solving up to D in Div2 or keep solving up to B in Div1
How to become M: Solve E in Div2 or Solve C in Div1
How to become IM: Keep doing the above
How to become GM: Solve F in Div2 or Solve D in Div1
How to become iGM: Keep doing the above
How to become LGM: Solve E in Div1
Sorry for shitposting, but I realized that if I can solve E in Div2 my performance goes from Expert to M which is stupid.
So, if you want to keep gaining rating just wait until you can solve the next problem in a contest.
Just enjoy the journey and the elo comes by itself i took 2+ years on various accs to hit 1700 :)
Solving the same set of problems at the same time can wildly, for example in WorldQuant Round 1 ABCD1E could get you high expert perf while AB1B2CE in Round 1118 was grandmaster perf
Summary: To become X in 2026, just try your best :)
Usually, in Div2 if you solve E or F you get checked, so most cheaters only solve up to D. I'm trying to say that if you have skill to solve E or F you can get a whole lot of rating.
How to become grey?
Maybe in the past, but now you can't compete with cheaters.