What are you into?
A good way to find stuff is keep hitting the random button and see what pops up. Some are so bizarre I can't even understand why they exist but some are excellent. Here are a few that might interest you.
Talented people making stuff.
https://www.reddit.com/r/ArtisanVideos/
People paying for stupidity with pain.
https://www.reddit.com/r/HadToHurt/
Unreal photos submitted by pro wrenches.
https://www.reddit.com/r/Justrolledintotheshop/
Cool machines.
https://www.reddit.com/r/MachinePorn/
People not thinking things through.
https://www.reddit.com/r/Whatcouldgowrong/