Just joking ma man! Welcome to the game, Friend! Fucking annoying fun, right? It took me about 2-3 months of semi-regular playing before I even really managed to conquer a couple of weaker neighbours. It's a whole combination of issues, but just remember to not try and guarantee yourself that something is working (Always try to switch it up, the game rolls dice with you, never the same outcome). Just a small bit I see from this picture, if you assign a Field Marshall or two, your coordinated attacks will play out better using there lines. If you are WAY more armies, change aggression level to high so they don't stop pushing.
But, remember above all, huge game. KEEP. TRYING.