They need to replace Onana at their main goalkeeper position but keeping or selling Onana, it depends on whether they already have a good one as a second goalkeeper if Martinez gets suspension or injuries. Onana is not good enough for a main goalkeeper position but for a substitution role, I think he ca do it well.
Man United needs a goalkeeper who can be relied on, especially when facing a match with great pressure, and I don't think Onana is the man. Emiliano Martinez could be a good option, while Onana seems better off being sold, and Bayindir remains as backup.
But the problem is whether Emiliano Martinez wants to join Man United, who are known not to play in Europe, or whether Man United is willing to spend a lot of money on him, considering that Martinez still has 3 years left on his contract with Aston Villa.
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It was even rumoured that Martinez was to be transferred to another team where he will play next next season, I didn't actually take note of the team though. I know Onana makes his mistakes, commits blunders and is even over confident of himself at times in the game, but that doesn't mean his not a good goalkeeper. Onana is actually a good goalkeeper it's just that he really doesn't have the back line that will protect him. If Manchester United had a good defence, Onana would have actually performed better than he had done for the team. You might not agree but just check out his statistics before he joined Manchester United.