Can anything be done to make my voice stronger?

Voice therapy: It depends on exactly what you mean by a stronger voice and in what kind of setting (speaking, singing, acting, etc). If you are a professional speaker or singer, i would certainly recommend voice therapy with a professional (also, if you smoke, then quit.). If you need help finding a voice therapist, seek out a local laryngologist (ent voice specialist). Best wishes.

Yes depends on cause: A full evaluation is important to find out the cause. This is typically done by a laryngology/voice specialist. There are voice therapists that work on voice strength and power that can help typically. If there is something structural amiss, a voice specialist/laryngologist can aid in providing help either in the office or with a procedure.