DND_Reborn
The High Aldwin
This reminds me of an experiment I did once for a game which ran about two years:This. And it became clear to me in my favorite D&D campaign (had a great DM) and from games that don't have levels, like when I GMed d6 Star Wars many years ago.
I thought I was a bad SW GM but they players were having so much fun fighting imperials that I'd get repeatedly asked to run games for my friends. I guess when every adventure was stick it to the Empire it was just naturally fun for the players.
I kept track of the XP instead of having the players do it. I told them when they had enough XP to level I would tell them, otherwise don't worry about it. The result was pretty good--no one worried about when they would gain a level and were happy when I said, "Hey, you two, level up your characters."
Nowadays, you could substitute session-based or milestone leveling instead.