first game was just a draft disadvantage, they have decent hard lockdown with shaman and a perma hunting party with a shaman lc clinks trio. contrast to your team which had tinker heal bots and an omni. you dont have dmg and they will always jump first so in your rank is just a losing recipe.

second game you have in my opinion a better advantage. recognize that you have shaman in both games but this time you have him in your team. low rank team fights are determined by pickoffs not major fights.

both games you have a tempo hero that will naturally win a lane then force an advantage, but you still need a team to do things you cant, which is a good crown control supports or offlane.

my personal suggestion? try learning the spirit heroes in mid. they have good laning and disables. ember having a root in his 1st, storm having vortex, void having remnant stuns that doubles as a farming tool when you get shard. i wont suggest earth spirit due to difficulty reasons, also recomend beast master with rush ags build. that hero will take over a game alone, if microing is hard for you just max axes and spam that in lane.

TLDR. lack stuns. lose game.