The only suggestion I can think of to help (uber end-game) people make PvP a more attractive option is to intentionally hold back from gaining more stats from Delves and Kingdom Power levels so that you’re able to find more opponents at the same power level or 1-2k more.
Mithran mentioned this here:
Note that it won’t work if everyone does it!!! So only tell your bestest friends about this mad exploit /s.
This is obviously a bit convoluted, and I fully agree with the below:
And just a reminder of the large consensus on this issue (second quoted post):
And Fleg’s one continues to trend upwards :