Add other sunnahs associated with each fard prayers , others like thahajudh, duha and more as a choice for those who'd like to do more than basics.
Let people connect with an accountability partner to have shared goals , celebrate milestones together and have shared challenges like praying all salah 5 on time for next days 30 days or thahajudh streaks.
Expand into a simple tracker for other worships like morning evening adhkar, quran and stuff