Why am i losing so much all of the sudden?

[Ted Theodore Logan]

You always play with only 3 men in the back, that's risky.

i guess its risky, but up till these past few days it seemed to work. i approach this game the way i like my football in real life, and i'm all about attractive attacking football, its the South American in me (i'm a big fan of Marcelo Bielsa and his 3-3-1-3)
when i first started playing i wasn't sure if the 3 defenders would actually work in this game since you are limited to what can actually be managed, but it seemed to work for months... i never truly understood what the blue and red arrows actually do but i always have my dmc with a blue arrow thinking that on defense that would mean he would provide a little help to the back 3, not sure if thats what the arrows actually do though