It's likely that you'll need any XP you can get if you're wanting to grind through levels. There are gaps where you'll have no solos left but be short of another tier (I had just hit 27 when I ran out of solos and had to grind to 30 to reach journey).
It's likely that you'll need any XP you can get if you're wanting to grind through levels. There are gaps where you'll have no solos left but be short of another tier (I had just hit 27 when I ran out of solos and had to grind to 30 to reach journey).