What do you think: Should I enroll in the College of Sharia, or should I enroll in another college and then join the College of Sharia afterward?

Beneficial sciences for the Ummah, whether religious or worldly, are fard kifayah (communal obligations), and Allah differentiates between people in their aptitudes. So, whoever Allah facilitates for him a beneficial science and he perfects his intention, he will be rewarded. As for the Islamic sciences, no other science compares to them in their honor, and if your heart is open to them, then focus on them. There is no harm in first entering another college and then joining Sharia (definition). As for the lack of job opportunities for graduates of Sharia colleges, if Allah knows from you the soundness of your intention and your sincerity, He will not abandon you and He will provide for you. Otherwise, Sharia would have become extinct. Consult the people of knowledge in your country, and before that, pray Salat al-Istikhara (the prayer of seeking guidance).