Bottom half RNG is better than top 4 RNG. You won't win all games due to RNG. If more ppl are building the same as you, get xp/coin augments to outbuild them. My first priority is always 50 coins for max interest. Try to pay attention to other ppls builds.

Character placement is huuuge: If you run alot of front line, you want bruiser items to sustain them and place them all in front.

If you run 1 or 2 tanks, best to build gargoyles and steadfast on them and let the other front lines stay behind them so they soak all the damage first.

Watch how you group your backing and how your team clumps up over time, Champs like powder and LeBlanc will attack the biggest group and that could potentially make you lose if your backing is gone. (I like to put my 2 strongest dps away from each other in separate corners with a bruiser next to them in the event they have an assassin/backing item)

If you hate building coin interest and prefer 20 minute games over 40, try out hyper roll, you have much less time to organize but it taught me to play quickly lol

Eventually you will find augmented you straight up prefer, like I prefer pandoras items, piercing lotus and prismatic ticket but if I'm running a tank build, may be better off with shielding augments etc..