there are like 80 human ships left

and no more can be launched until the debris around earth is cleared up because most ships are made in earth

the ships get together and make a surprise strike

I dont know much past that

Sounds like a decent framework.

I was thinking about having some religious aspect for the aliens

Other colonies on both sides?

like there is some sort of artifact on the rogue planet

yeah

lots of colonies and allied alien species

like earth is allied with aliens from nearby systems

Okay. Then it gets more complicated.

yeah

You have to detail out the other races, plus why they're allied with Earth, and why they're not competing along with the TRAPPIST.

good idea

I was thinking of the nearby species being more human like

the TRAPPIST species are bug like aliens

Unless you're going Trek-style, even humanoid aliens are still aliens.

yeah

I was thinking humanoid aliens were more sangheli like

sangheli from Halo

I've never played Halo.

ohh ok

that

sort of reptilian allies

explained through exogenesis

the TRAPPIST species evolved on a hot planet, therefore the bug-like body

Okay. Here's the hurdles:

You'll have to postulate why the allied races don't have their own ships, or why they're not available.

they have their own ships too

they dont have many

they're less advanced than humanity

Also describe how being cut off from Earth affects the relations, because other than just being friendly, they need a realistic reason to be allies. Trade, mutual defense, etc.

good idea

this takes place around 4000 AD

so far future

Since they have their own ships, there has to be a reason why they can't bolster the Earth fleet. Refits from the war, a simultaneous strike that hit them, etc.

They do help the human fleet

they have worse industry than humanity

so the other 2-3 alien races only supply about 40 ships