If you can't accept by now - immediately after another election demonstrating the fact - that centrism across the whole of Europe is gone and not coming back then nothing I can say is going to change your mind. The choice is between systemic, egalitarian reform and the far right resistance to it.
Sheesh, if you can't even read a simple election result without spinning it like crazy to mean the opposite of what happened, what hope is there?
Here are the facts.
The three main winners in the European elections were:
1) the liberals of ALDE (UK LibDems, Macron, FDP, as evil a bunch of centrists as you can think of): up 36 seats or +52%. ALDE went from fourth to third largest group.
2) the far right ENF (Lega Norte, FN, Vlaams Bel., FPÖ): +22 seats or +61%, all from Lega Norte. The ENF is still only in 7th place.
3) the mainstream Greens: +17 seats, +32%. The Greens went from 6th to 4th largest.
The other far right group, EFDD (incl. Brexit Party) picked up 12 seats +28%, not exactly a landslide.
Losers:
1) The traditional pro-EU right (EPP) dropped 38 seats (-18%). Mediocre performance by the CDU, and the French LR got slaughtered by Macron and the FN.
2) the socialdems were down about the same: -32 seats or -17%. 11 of those seats were lost by the German SPD, 10 by Corbyn's Labour and 8 by the incredible vanishing French socialists, so the phenomenon is not confined to the UK.
3) The Eurosceptic ECR (True Finns, PiS, Tories, SWE Dem) lost 14 seats/18% and 3 places, now ranked 6th.
4) The nearest thing to your "systemic, egalitarian reform", the left wing GUE/NGL (die Linke, Syriza, assorted Communists, Sinn Fein etc.) lost 14 seats (27%): not exactly an endorsement.
Looking at it more broadly, the far right/populist lot made gains in some places and lost in others: gains in Italy (Salvini up big time but 5S down), small gains in the UK, flat in France (Le Pen actually lost one seat), down in Germany, the Netherlands, Denmark, etc. Overall, far right and Eurosceptic parties picked up a few % but are still where they were last time: about a quarter of the vote, with such widely different agendas that it takes three different groups to accommodate their rivalries and dissensions. The harder left took a beating.
Centrism is alive and well in Europe. Things will get done in the EU by some coalition of moderate right, moderate left, centrist liberals and greens. If you can't see that, you haven't analysed the results enough.