War front, time walking, 4 Mythics.
Just to name 3 off the top of my head.
To be clear you do not have to be a huge iLevel if you are not taking part in harder content. There is nothing that says you have to be 408 iLevel. If you want a better iLevel build a friends list. Find people you like running plusses with.
Find a guild that does normal or Heroic raiding. This does not mean you need to leave your guild. Just find one that you can tag along with regularly.
When I came back to the game my guild was no longer a raiding guild. So I would pug runs in Niggthold (EN) as well towards the end.
Day one Tomb came out and cleared it on normal. That night went looking for a Heroic run. Got a group. Went with them Thursday as well. Then the next week. Etc.
I am an officer in that guild now. The responsibility is on you to push and find people to do the content with.