So many things:

• A closed caption system like youtube. I’m deaf so 90% of peertube videos are just unwatchable to me.
• A working mobile app.
• An easy guide to instances that is clear on which instances are mainly local vids and which basically federate with everything. Ideally, a couple, lemmy.world, lemm.ee style peertube instances that are general purpose and kind of have everything I can direct people who want to join too.
• A non-personalised algorithm. Ie. recommend similar high rated videos.