Need help with Amirdrassil raid

Hey everyone, I am a casual wow player. My bf got me into wow but I have less money for subscription so I have a wow sub like once a year. My favourite thing to do is fly around the Dragon Isles on my Highland drake. I am not a big lover of raiding but I love the story so I need to do raids too. I just got sub again after more than a year and I missed the last 2 DF raids, my last one was the Vault of the Incarnates. I am currently doing the Emerald dream storyline but I can not do the Amirdrassil raid alone despite leveling to 80. I know about LFR but DF is not available on LFR yet I believe, and I can't find DF raids on raid finder. I really need to defeat Fyrakk to progress in the story but everyone has moved on to WW. What do I do? I don't know a group of 20 people to raid with. Do I need to wait until the next expansion so DF becomes LFR? Is there anything else O could do?

I would appreciate some help!