Soft voice

There's obviously a voice coach, but that can be costly. I would suggest that you see if there is a Toastmasters group in your area. I never belonged to a group but my understanding is that it is for people trying to improve their public speaking skills. I would think that might be helpful. Best of luck to you!

I think it is possible to make your soft spoken voice to become harsh and manly. First you might want to try speaking with different part of your oral cavity, perhaps you can utilize the glottal more and try to control the air flow too. Other than that, you can try increasing your male hormone level which is testosterone. You can increase the male hormone through various ways including doing extreme exercises and get aroused more often.