You don't need to complete any tasks once you're in Cosmodrome. You can drive over the land slide and drive around the right side of the rocks near the fallen trees, going through the water near the shore. If you don't cross over the river, you also won't need to complete that bridge.
Getting to this map is gonna be a huge pain naturally, first you need to build a bridge or 3 then you need to go the heap pile thing or something, THEN SCOUT HALF OF THE MAP REEEEEEEEE
I did the heap of work mission, and built just one bridge just for ease of pain. Did it in 4 sessions, my patiens did'nt allow me trying to do it in ome go 🤣
once you reach the Cosmodrome it was service spare parts to fix the trees and thats all you need to do, just stay left and avoid the old bridge, get to the church and drive over the rocks, done
I did the stargazer task with cat745c fuel tank, dragging a azov 5 service body. did not need to do any other tasks just went straight to zikz, was a super pain tho they added a rock now on the bank leading to the zikz, i had to go through the tiny trail in the rocks to the right of it.
HINT: At 5:39 they put a big rock so you can't get over... right bevore it just drive to the right and over the hill. On the map you can see a very thin path drawn.
I used an op modded truck to pass everything, I even went into the river by the wooden bridge and it probably took me half the time to get there than it took you. i also found a way around the fallen trees.