-Notifications
-PMs/DMs
-What if there was something that incorporated Packs and Lineups! Basically, you can open packs with very low odds again and again, and the best players you get go into your weekly lineup! The person with the highest overall wins!
Notifications are coming, but it's a big feature that takes time to get right. DMs are on our radar, but not officially planned yet.
Idk if we would do anything official around your third idea, but I think the community could organize something similar in the forums. Maybe something like open as many Pack Blitz packs as you want and save X of them. You can build a lineup only using players you have in your saved packs. Sounds like an interesting challenge.