I have to fight a 3x strength Scourge Crisis all by myself, HELP

I was in a game playing determined exterminator and I determinedly exterminated the rest of the galaxy (save the materialist fallen empire and the machine fallen empire, which are both pathetic in fleet power compared to me). I have another exterminator ally in a federation with me, but his fleets, tech and economy are all pathetic as well. Also, he's really small and can't do anything to help me.

I have about 12 or 13 fleets, each of which have about 170k to 180k power each. However, the scourge have WAY more fleets than I do, and each of theirs is worth about 300k, with some vanguard fleets worth 180k. However, I do have a massive economy and am earning a couple thousand alloys per month, as well as 27k energy credits per month as well.

But even with all that, I'm not sure if I'll be able to take on the scourge successfully. I am building as many fleets as I can but I'm not sure if they can go up fast enough, or if by the time they finish that the scourge will have even more ships and that any attempt to keep going would be overshadowed.

So, do I still have a chance? Or should I just delete my save and play inward perfectionist to punish myself?