The only Nesmith solo joint that has really impressed me is "Tantamount To Treason" c. 1972. That's a weird vibey "prog country(?)" album.

The earlier "First National Band" albums might be classics if "country rock" is your thing (it's not really mine.)

Don't think I've heard his later ones though (he did a concept album, think it was called "The Prison" -- never heard it.)