When I was last there for the league game in 2019/20, we headed for Northumberland Park overground station afterwards as it was around a 15 minute or so walk instead of the half hour or so to Seven Sisters. From Northumberland Park it was a train to Tottenham Hale - 3 minute journey - and then a tube from Tottenham Hale to Euston. It worked out well for us but not sure how much wiggle room you have after the match this time round - is it only around an hour from the match finishing to catch the last train home? If it is then that's tight for anyone staying until the final whistle.