As pash said, it doesn't help or alter anything for the coming seasons (24-25) European places, they are set.
But their win means Greece moves to 15th place in the rankings and for the European season 25-26 we will have 5 teams in Europe. Top 2 will play Champions League qualifiers, 3rd and 4th Conference League qualifying and the cup winner will play in the Europa League qualifiers.
Now this also happened in 2022 when we made the Conference League quarters, Greece ended up ranked 15th and with 2 teams in Champions League qualifying earlier this season (AEK and PAO) but we obviously slid back down the rankings and that's why next season there is only one team in the Champions League. Thankfully that's us.
So hopefully Greek teams (not just us and Olympicos) can go on with this and have runs in Europe and continue to push the nation up the rankings and we can hold onto the 2 UCL spots as well as gain ground in the qualifying rounds and maybe even add an extra European ticket.
Because when you look at the country coefficient, on paper there is really no reason we couldn't be ranked around 10th. Currently Norway, Austria, Switzerland, Scotland and the Czech Republic leagues rank ahead of ours. With the big 4 teams in the shape they are currently in, there is no reason we can't push past these countries in the next few years and end up with much better European tickets than we currently have.
https://www.uefa.com/nationalassociations/uefarankings/country/?year=2024