Until I was in my early 40s, I would have told you I was exclusively a bassist. The real question for most of this time was if my focus was mainly on upright or electric bass
Songwriting, guitar playing and singing have been competing for bass time recently but my only gigging band has me on the bass right now
In the last handful of years I have studied (with a teacher) voice, piano and drums.In addition to trap lessons, I played conga for a few years in an Afro/Cuban dance troupe.
I think all of these experiences add to me being a better bassist. As for guitar, I am actually figuring out how to play lead a little bit right now! I have also been dabbling with the mandolin, like many of you - what a gorgeous instrument, and can't argue with the size
Songwriting, and recording my songs, has taught me a lot more about being a bassist than I thought it would. I have learned to serve the song vs looking for the coolest bassline.
I would be a better bassist if I limited my focus to bass. As is, I just hope to keep learning to be a better musician.