I was wondering if there was any way to improve your range if you have a deep singing voice to hit the high notes
Falsetto, or cut your balls off
Dean RC7X (Bareknuckle Coldsweat pickups)
Ibanez Rg2570Z (Bareknuckle Juggernaughts)
Schecter KM-6
Schecter Hellraiser Hybrid 7 String
Engl Powerball II
Orange PPC412
Line 6 Pod HD500X
You can train to reach a bit higher than you naturally would. Smoking makes this worse, so don't smoke, for one, or quit if you already smoke, and reap the rewards. Look for videos on belting. Also look for videos on head voice. Head voice is technically different than falsetto, but very similar. Most people that have not really studied singing wouldn't realize there is a difference.

Lots of practice also. Singing is like any other thing, the more you practice your muscles and technique and whatnot, the more ability you gain. You will keep a low register chest voice that you can raise a bit with belting, but you could reach a real high range if you include head voice and falsetto in there.
Vocal coach.
Spend a couple sessions with them working on your range to get a realistic idea of where you can sing. If you are a natural baritone, make the most of what you have and change song keys as needed to get into your range. If you think you want to sing like Steve Perry you will live a very frustrated life. No amount of practice or technique can make an Oak tree into a Sequoia. Different DNA.
"Your sound is in your hands as much as anything. It's the way you pick, and the way you hold the guitar, more than it is the amp or the guitar you use." -- Stevie Ray Vaughan

"Anybody can play. The note is only 20 percent. The attitude of the motherfucker who plays it is 80 percent." -- Miles Davis

Guthrie on tone: https://www.youtube.com/watch?v=zmohdG9lLqY