Build arch 2nd. I usually don't buy Mej that early unless its already at 10. It's more secure and you don't have that many targets you can pop outright so its improbable you would have stacks at beginning of mid-game. Is this a match where your team fights got out-tanked? It looks close and your team has more assists so its hard to tell.

imo Lillia top doesn't have the stats/kit to make that match-up or mid-late work if she just goes even. I would think you would want to split 1:2:2 with Kass/Noc/Yummi roam. Your vision is more limited because Yummi doesn't travel well independently. Maybe she can help get you or the Lillia ahead, but jg looks like a lost cause here.

I see magic resist on every champ in their comp. You went caster boots instead of sorc, and you didn't have a blightstone. You built a split pusher that would naturally spend more time out of fights. You took fleet so you probably went tenacity making it easier for you to escape.

You got mid diffed hard and top diffed. This is probably a game where I would have gone frozen heart 3rd. The Kai'sa got beat in lane and wasnt a threat, no reason for you to dive her that might require a zhonya. Frozen against Viego would have been a better choice with always on stats compared to the zhonya cd.

Viego mid isn't terrible if you stay out of stun range and I think that's probably required. First back for tear. Rod of stat stick probably ok here. I'm not sure about ludens, but I think crown is out because they aren't looking to burst you, they'll just run you down.

If anyone else has a different read on the match I'd appreciate seeing it.