You have now conquered your shiny Italian golden owl. Yay!Now it's time to advance to the next tree level and probably discover more content and harder lessons with each level.
You didn't do enough Italian lessons recently but you still have to finish 73 more sessions to get all of your skills to Level 5 — check back here when you practice a few more lessons to see how soon you're supposed to level-up your Italian tree. The longer you practice, the more accurate is the prediction.
Keep going! =)
If you ever wondered what are duolingo lexemes: these are lexeme_ids from our extended profiles and they are actually neither lexemes nor words since they include all word forms and they also include combined lexemes such as "bonne nuit" in the French course, and there are a few duplicates as well, but the total number is consistent across all users having completed the same tree version and apart from lessons and skills it's the only countable number in your profile that can tell you a little bit more about your tree progress.