I would say:

1. Bitcoin1. Bitcoin

• Fungibility, which is, a property of money that Bitcoin does not have.

2. Lightning2. Lightning

1. An easy and standard way of integrating lightning payments everywhere (games, stores, websites, social media, ...)
2. Non-custodial wallets were you don't need to worry with channel capacity

Point number 3 is rapidly evolving so it is still too early to know where it is going and what it lacks.