Is my roster good enough for the Epoch of Pain?

I've had a problem lately with the game where I am in a spot where content is way too easy or way too hard for me to bother with. I want to play the game but I don't know what content to do. I thought I'd ask if my roster is good enough to attempt the Epoch of Pain or to wait for more r3 seven stars? The images I have attached are in this order: All of my 7star r3s, All of my 7star r2s, Some of my 7star r1s, 6star r5s, and 6star r4s. If there is any champ there that you recommend ranking up further that would be a great help as well. Thanks!
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Now go and prove me wrong.
I'll be waiting. All the best.
You should edit post and attach pics using camera roll
Take some practice runs and before spending resources, don't be afraid to back out and restart.
I didn't look at your roster, but if you have Sentry as 6 or 7*, rank him up and take the debuff path that starts with Nebula. He can pretty much take the whole lane himself.
Good luck. You'll never know if your roster is good enough until you try.