There are always many things you can do with your time, but implementing silent payments (https://github.com/bitcoin/bips/blob/master/bip-0352.mediawiki) for Core Lightning is rising in my to-do list.

Unfortunately, we are all PSBT internally, so we need support so we can receive, which the authors argue (sensibly) should be the first priority for wallets. There's a delving post on this, so I did my bit by annoying Ava Chow into looking at it. We can probably hack in some experimental thing if we need for now, but proper support on libwally would smooth the path for Blockstream Green in future, which frankly is a much bigger win than CLN support.

Looking forward to the day when they're not "silent payment addresses" but simply "Bitcoin addresses".