Seeing team like Manchester United celebrating qualifying for the UEFA Europa league competition always get me sick as a true Manchester United fan. Though been part of the team that will participate in the European competition next season is not a bad one for it is not easy because somany teams are wishing to be there also.
I believe Chelsea team and there fans will not be happy, just like you have said it is truly unimaginable, even winning Manchester City in the FA Cup final was still unimaginable.
There's no need to be fed up with this, mate, because whatever the result and wherever the Manchester United team will compete next season apart from the Premier League, they must still enjoy it and run it well. And as a fan of the team you yourself also have to be more optimistic about the team's performance next season because every season there will definitely be differences so you don't need to remember the things that happened this season to imagine them again next season.
There are times when any team will still be grateful to be able to play in the European league, including Manchester United. They almost didn't get anything after only finishing in 8th place in the domestic league and they deserved everything after experiencing such a dark season in the domestic league. What happens if they don't win a single European competition and that will make the perception of the Red Devils even lower considering that last season they were able to go to the Champions League.
If they don't win, of course Manchester United will only be able to enjoy a boring game in the domestic league and their return to the European league will make the competition even more colorful. I think Manchester United must be able to prove their capacity in this competition and at least I want to see them progress to the quarter-finals next season. However, if they succeed in freezing public expectations and even reaching the final round, it will be an extraordinary achievement whether they win or not.