Even if United had a striker in the rung below Kane, United would be solidly in 3rd place and closer to 2nd than 3rd, if not 2nd.
Chance creation and conversion (together as one offering) has to come more from individual players rather than one person only scores (Marcus), one person only creative clear chances (Bruno), and the others struggle with doing either most weeks (Sancho, Antony). And being creative doesn't always mean the spectacular, rather passing to the right space or player at the right time for the team.
You see City doing it before Haaland, relying in KDB, Mahrez, Foden, Gabriel, Bernardo Silva. You see it this year with Martinelli, Saka, and Odegaard. Pool had it with Salah, Mane, now w Jota, and the two young left forwards (not Gakpo). Spurs always had it w Kane and Son.
Having a legitimate CF will help a lot, but not to the point of having a 2 goal per match average. The entire team must increase their output in goals scored and chances created.