This works for me, but my parents looked at me funny when I did it, so maybe it won't work for you.
Find a podcast or audiobook whose style you wish to emulate. Audiobooks are good because then you can follow along with the text as you're listening. Try to say the words in
exactly the same pitch/tone/inflection/volume as the audiobook reader. Once you think you've got it, record yourself and see how similar you sound.
Many people are amazed at how little inflection is in their voices, even when they're trying to imitate someone with inflection. If this is the case with you, you'll know that you need to practice making your voice do what you tell it to do. Try voice lessons, or go find a series of vocal exercises to do. Continue to read along with your audiobook. The more you practice, the better you'll be.
If you can imitate his tone perfectly the first time, then your problem lies more in the area of
determining the correct inflections. Again, listen to the audiobooks more, but try to listen to what the speaker is doing. Listen for how the inflection affects the meaning and clarity of the sentence. Emphasis can change meanings significantly. A pause in the right place changes "A woman, without her man, is nothing" to "A woman: without her, man is nothing"
Or PM me, and I'll do your recordings for you, for a small share of the profits.
