I study Aerospace Engineering. To put it simply, Aerospace Engineering is a very interdisciplinary field. For one, Aerospace Engineering is classified into two- mainly aeronautical engineering and astronautical engineering. Both of which are essential in building Asgardia somehow. within aerospace engineering are more sub fields that you can pursue further studies or research. Fields like Advanced composite materials, aerodynamics, Astrodynamics, thermodynamics, and many more. well, the most important thing to keep in mind is that you are passionate about what you do, and you don't have to worry about the certain field you have to take to help Asgardia, all engineering field is greatly needed, even fields in biochemical engineering (which in my opinion is quite far from developing spacecrafts). Always remember that you are an engineer and engineers stress innovation.