My guess is this phase of the MCU ends with Sylvie in the same position but deciding not to kill him. Either that or Loki having to kill her in that moment before she kills Prime Kang. Somehow we will see a replay of the Loki finale with a different result.
Since we know the Fantastic Four are coming this phase, I see them playing into the resolution somehow. Dealing with Kang related multiversal chaos is very much in their wheelhouse.