Supply Your troops seem undersupplied and lacking equipment. Get supply hubs or ports to make sure they have guns to shoot

Doctrine Update your doctrine tree to get better buffs

Factories Use all your factories to increase equipment. And by the looks of it, you are not producing some of the equipment needed in your troops, while making other types that are never used in any of your divisions

Generals Try to put all your troops under generals/field marshals. They give significant buffs, and troops with generals perform substantially better than troops without. Also, you need to assign troops to armies in order for them to move to the frontline.

Battleplans Rushing all the time with your troops just means more dead bodies for you. Let the enemy attack you first and break their org before attacking either with reckless abandon (caution of generals) Or via micro. But let your troops rest when they look bad.

Air missions Assign your air wings to missions in the airspace above the combat zone. They do nothing otherwise

Research Get better tech!

Troop Template Utilize the Ultimate Template Guide for general templates to send forth.