To get that "wall of sound" heard on the album, don't just rely on one track. Record your guitar twice (Double Tracking)—play the part as identically as possible, then pan one take 100% Left and the other 100% Right. If you'd like to dive deeper, let me know: Are you using or passive pickups?
How James Hetfield Gets That Iconic Metallica Guitar Tone! [Part 1] Guitar Rig 5 Metal Preset Metallica Master Of Puppets Box