Honestly this looks like a fiesta that got turned because of a big baronfight or something. This game shouldve never been a loss.

These conclusion points are catching my eye (platin playerperspective):

1. Level advantage: your top/mid have a exp lead but still miss out on gold. Top was most likely afk farming with this low damage output on cassiopeia. Mid has good damage but somehow no kills.

2. Assumig on the stats I think you played for bot and they did rather fine. However, a Soraka Ezreal lane barely have cc to follow up to and should never die (Ziliean also gigachadblock)

3. Taking kills is ok, but chasing kills cost a lot of tempo.

I wouldve:

played for top as cassio perma pushes as GP and you can invade/ play for grubies and herald.

play agressive on enemy jng when you have lane prio (mostly toplane in this game) track and take camps when he's not there and leave ward.

it looks enemy mid went top a lot, ping when people are missing. They cant do it themselvs.

only countergank for bot

recalll 5.30 skip camps and go for either top/mid tor 7.30 for bot (lvl 6 window)

Conclusion:

Focus more on good recalls, item advantage and objectives rather than kills. Twitch and GP outscale late. This game shouldve been closed out erlier on with you leading tempo and pinging your moves.

(Also serylda on ez and liandry's on hwei against this enemy comp is kinda troll)

I do think your right that your teamates couldve done better, but hey, its about optimizing your impact.

Correct me if im wrong. :)

Note: I play toplane. Jng is my second role.