How can I make my guitar sound less flat and wider?

Since a time ago, I’ve been recording my tracks with audacity. I bought a mono mic and I’m saving this in stereo mode so I have the same signal on the L and R channe. Now I would like to do something with this tracks in order to make their sound less flat, so they can integrate better along the backtrack.

Does anybody knows if there is a way to do that without using effects like chorus or reverb.

Regards
Patricio

A high quality microphone will produce a much livelier and richer sound than a cheap microphone.
Also, why without chorus or reverb? The main use of these effects is achieve exactly what you are asking for - These effects should generally be used with a bit of subtlety, it’s easy to overdo it and make it sound like mush.

You could also try “double tracking”, either manually by recording the same thing twice, or by making one or more copies of the track and shifting their position in time just a little. You can adjust the levels and pan position of each track to suit your preference.