Ahh 3 front war somebody please help me and give me advice for victory

[dmm]

If your ships are way outclassed, then try to run in close and ram the enemy. Since the vagaries of SEIV physics do not allow retreats, it isn't even a question of morale or patriotism -- your crews can die in the ramming and possibly inflict grave harm on the enemy, or they can try to fight a hopeless battle and let the enemy wipe them out for free.