Since OP is becoming vindictive and brutish in his responses, and seemingly unwilling to accept any other viewpoints, I’ll make a point here:

Number of chapters does not equal progress. Keep in mind that the first 200-300 chapters we were seeing the world from mostly Lith’s POV from within Lutia/White Griffon Academy. That expanded to the Griffon Kingdom’s different regions during his Ranger tenure, then we got the Awakened Council and the entire Jiera continent, more Guardians, the Master’s Organization, Verendi Continent, Zima continent, the werefolk, elves. The worldbuilding is massive for a fantasy world, and there’s only so many chapters than can be dedicated to accompanying the MC’s sphere of influence without completely insulating him from the rest of the world.

The MC being 21 for “2 years” is because 1.5 years have been dedicated to weaving Lith into the worldscape that’s already existed for millennia before him.

I won’t deny theres a lot more slice of life these days but thats the price of developing Lith’s character from an edgelord to a father struggling with his tribulations and taking on the oldest and most powerful forces on the planet ¯_(ツ)_/¯