2035 and it's game over already:
When it reached earth it had 10 ships more reinforcing , 3 motherships with 78 destroyer and battleships as escort. Dont know what i am supposed to do,probably nothing at all twiddling my thumbs till 2050 or so in hope i will build something good enough ?
This screenshot makes me believe you lost the geopolitical game much before that happened. 83 science by 2035 is a joke, 138 mission command is very low and 3.4 influence tells me popular support on earth for the resistance is almost non existent.
So a few tips for that:
BOOST is only useful early in the game, never invest on it, just try to take Kazakhstan and break the federation with Russia, also early in the game some orgs provide meaningful boost, once you start producing water, volatiles and metal in space boost becomes of very little use. Instead invest on Mission Control from the get go, specially in small countries since IPs are a lot more efficient on small countries than in very large countries. For example control many EU countries, invest fully into mission control and and merge them later into the EU.
Something that maybe you are missing is Interface Orbits, Low Earth Orbit 1, LEO2 and Tiang Gong and ISS orbits are interface orbits. When you place science modules there they provide very interesting bonuses on earth that should allow you to keep faction's popular support high and control the big countries as well as help all countries you control with bonuses to investments in different areas such as Mission Control, military tech, economy,
public campaigns... these bonuses have a cap you should try to get all of them up to it, your measly 2 science station on earth make me think you probably didn't. Over time they add a lot.
In relation to the previous point RING and COLONY techs are paramount to get the most of... well everything related to space economy: more tech, more bonuses to EARTH, more defences on bases/colonies, faster and large ship building.... make a run for the two techs.
Which brings me to another point, try to direct as much of earth's technology as you can. You really need to produce lots of science to keep control of at least one of the three science slots to steer world science towards key techs.
Well geopolitics is a very complex topic with many different aspects but I hope this helped you for your next play through.