It's reasonable for me to have a two-way foil for a second-level civilization, right?

[Technology + disaster + interstellar + technology tree]
In 2050 AD, the sun is affected by unknown influences, and the helium flash is about to erupt!
Earth at stake?
It doesn't matter, I'll do it!
The three-body galaxy, the neighboring star civilization is about to invade?
It doesn't matter, I'll do it!
Dark universe, high civilization disputes everywhere?
It doesn't matter, I'll do it!
……
Starting from controllable nuclear fusion, the protagonist Lu Yongchang opened the interstellar era of human civilization!
Aerospace planes, space elevators, energy weapons, antimatter preparation, grand unified theory, curvature navigation, two-dimensional debris (two-way foil)...
Methane ocean, mysterious species!
Liquid ammonia planet, physical fusion! !
Dimensional creatures, dimensionality reduction strike! ! !
In the endless universe, what mysteries are worth exploring? !
Disputes among advanced civilizations, how should human civilization handle itself? ! ...