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).
Don’t seem worth it to me, but that’s more based off last year. I’m not entirely sure what’s in the reward packs
they worth the time? What do you get in the reward packs, anything with the unis?