Let me share with you one of my hobbies, it's propagating succulents... I've been doing this since I moved into my very first own apartment and I still enjoy doing it. :)
Every time my plants look like this I take them out and remove the dead leaves and also cut off some good ones.
Then I leave them for 2-3 days on dry tissue paper till the cut has dried.
Then I put them in damp but oligotrophic soil.
After some weeks new tiny plants are growing...
When those are big and strong enough I cut off the old leaf and plant them in normal soil.
Easiest thing ever. ;)