There are still some rumours linking Vettel with Alpine for 2023 season. It would be lovely to watch him driving a faster car after struggling with Aston Martin most of the time. However I don't think that Vettel is thinking of changing his mind seriously about retiring at the end of the season. Besides I believe that he should be a part of a team that are fighting for the championship even if he continues in F1. Maybe he can't be the main driver of such team now but he would still do a good job as the second driver.
Mercedes were linked with him some time ago to fill Hamilton's place when Hamilton decides to quit F1. Maybe this could happen in the future even if Vettel retires. But they would need to make a big effort to convince him to return to this sport again.
I wonder if they would make a good duo with Russell also.
Personally, I don't think Vettel will resign from the resign, why would he do that so quickly? At Williams I think after the excellent performance at Monza N. de Vries will get a cockpit, as N. de Vries was mainly at Mercedes I don't think he will come to Alpine or a non Mercedes team, but there is probably only one cockpit left at Williams. But some seats are still available for 2023, here is a small overview.
Red Bull: Max Verstappen, Sergio Perez
Ferrari: Charles Leclerc, Carlos Sainz
Mercedes: Lewis Hamilton, George Russell
McLaren: Lando Norris, Oscar Piastri
Aston Martin: Fernando Alonso, Lance Stroll
Alpine: Esteban Ocon,
AlphaTauri: Pierre Gasly,
Alfa Romeo: Valtteri Bottas,
Williams: Alexander Albon,
Haas: Kevin Magnussen,