I'll echo the advice on not playing over-saturated parts.
Especially with lower quality amps...
That can create a "bee hive" effect.
If you're looking for a big/fat sound, start with the instrument/amp.
To me, that would mean playing a guitar with humbucker/s... thru an amp that produces a big/bold sound.
Les Paul thru a Marshall is a classic combination. Classics are classic for a reason (they work).
Mic the amp with a mic that'll capture/flatter the perceived size. Shure SM7B is a great choice for this purpose.
Can take super high SPL, yields more top and bottom than an SM57, and the large diaphragm will help yield a larger sound (which is why the SM7B is popular in radio/broadcasting scenarios)
As has been mentioned, double-track the rhythm guitar parts... and pan them left/right.
IMO, There's no substitute for recording a real/tight doubled track.
The subtle differences in timing, pitch, and nuance provide a very sweet "stereo animated" result.
Delaying a copied track can work... but it won't sound as "alive" as a real double.