Greetings, sir. I believe I could be of great help on your project. I am a lyricist, guitarist and singer for over 10 years now and I'm highly experiences in mixing and mastering also. I practically grew up on rock, grunge, punk and metal music so that's my area of expertise. You can check my portfolio to hear few tunes that I've made, mostly are acoustic songs because that's the genre that I prefer to work, but rock and metal pieces are also there, if needed. So I would like to offer you my help on this project in the form of mixing and mastering, but I would like you to participate in it with your ideas, because you probably know how you would like it to sound, just don't know how to manage that. Two heads beat one in this case. If you want to ask me some additional questions, please, feel free to do so here via messages, I'll gladly answer them for you.
Best regards and I hope we'll get to work on this together, Bojan