All light level does is artificially extend play time. Making the player spend hours on end each week doing the same activities over and over so then can do harder content down the road. If you want people to play ritual activities, which I abhor, then make high stat armor with passive abilities available for that activity. Much like the seasonal armor, Iron Banner, and the likes available in those play list. Along with new weapons to farm. As for making GM difficult, keep the same system in place and put the enemies a few levels above the player. Light level is just not necessary at all. There are more creative ways to “gate” the community than this arbitrary system that feels like punching a time clock rather than playing the game for fun.