When will the other Young Justice season 3 episodes be available?
The second half of Season 3 is being released in June. Just in case you ask why, they are still working on the second half of the season.
You may have to wait but there is still plenty of content to enjoy. Doom Patrol will be having episodes up to May and Swamp Thing will premiere before June as well. 
I’m watching young justice season 3 and I just finished episodes 1-13 and now episodes 14-23 are locked can someone please tell me why that is, cause I’m hooked and I need my YJ fix.
The second half of the season, episodes 14 - 26 aren’t finished yet. They will premiere sometime in June.