I am looking for some newer literature for the beginning
(4-mallet)marimba student. When I was an undergrad,
I remember playing through the Mitch Peters pieces, and
Alice Gomez. These worked for their assessability, and use
of fundamental techniques. However, I am interested in
learning of any other composers, and/or specific pieces that
I could use in addition. Thanks!

A couple that I haven't recently discovered for my own students are Ney Rosauros "7 Brazilian Children's Songs", and Keith Larson's "Little Suite". Both are really great as a first 4-mallet solo.

I got a look at cognitive dissonances by frank bloom and it looked to be a very managable 4 mallet solo for a new player. Utilizes some of the fundamentals.