There’s really no exp wall besides lvl 160 dungeon which is poorly designed. If you have done all the quests on both sides even if you pop them early, you will get past the exp wall.
My second character is now lvl 135 and I still am doing the lvl 84 quests. How I did this is through dungeons, 100% map exploration and updating your monster list for WingsofVibora on all maps including those puzzle dungeons. This may not be an early knowledge to new players though.
This is how the Super Mario bros did by slowly giving map design as early hint tutorials with the mushroom and a solo goomba at the start. I prefer players finding out themselves than a hand holding tutorial.
Their experiment is working good for me. The exp card boosts my motivation when I pop them all up and see my level go way high. To each his own opinion I guess.