Stop letting computer-illiterate people believe it's okay to run Windows when they aren't going to be responsible about updates/safe computing?
Dance in the rain and sing magical incantations.
Convince Github to release lists of attacking IPs. Then we can all try to reverse takeover the botnet.
You can't do anything yourself other than look for alternatives or self host.
The only real thing is to encourage behaviors that stop people from having their machines compromised. Most of the DDOS attacks are masses of compromised machines.