How to pick
Don’t pick seven. Pick two, maybe three. Look at the list above honestly: which items scare you a little and excite you a little? Those are the ones that count. A bucket-list challenge you’re already capable of doing isn’t a challenge — it’s a scheduled task.
Once you’ve picked, work backwards: what’s a twelve-week programme that gets you there? If you don’t know, the first entry on your Kriya list isn’t the goal — it’s “find a twelve-week programme for X.”