All the public libraries I've been to in the US use a decimal classification system that I assume is Dewey Decimal. For example, programming books are under 005.* AUTHORLASTNAME.
Exercise helps because it completes the stress cycle[1]. When burnt out it can be hard to find time, so try one of these and see if they help:
* High intensity intervals. Do 2 minutes of light intensity cardio as warm up. Then alternate 20 seconds at top effort with 10 seconds of rest. 10 cycles of this will only take you 5 minutes. You should be out of breath by the end.
* Faster version of yoga woodchopper pose[2]. Stand with feet apart and knees slightly bent. Clasp hands and raise above head. Bend knees and bring your hands down while you exhale with a loud "Ha!" Do it slow a few times for warm up, then do it fast and imagine your hands crushing a stressor at the bottom. Yell if it won't disturb the neighbors.
* Tense your whole body for 20 seconds, then slowly exhale and release the tension. While tensing, imagine either beating up or successfully running away from something that is stressing you out.
Radiopaper is both empowering and requiring every user to be a content moderator. Let's say Alice and Bob sign up and start holding interesting conversations. Then Nasty McNasterson starts sending hate mail and death wishes to Alice and Bob. Alice and Bob can stop Nasty's messages from showing publicly, but first they have to see the never-ending stream of abuse. What can they do to stop this? Can they block Nasty from sending them messages? If enough people block Nasty, can Nasty be kicked off the platform? On the other hand, if Nasty and an army of sock puppets (or a brigade of chat buddies) block Alice and Bob, will they get kicked off instead?