Whatever route you decide to go, consistency is key. As a harpist I work with a lot of instrumentalists and sometimes even vocalists. My specialty is providing solo harp or piano music and creating ensembles designed to enhance the harp. When clients approach looking for a solo cellist or violinist, I always advise that they consider the repertoire they are requesting prior to booking a purely solo instrument that lacks the capability to perform both melodic and harmonic lines simultaneously. The reason being most clients, are not familiar enough with music and the instruments of instrument to understand that booking a solo cellist will not provide the sound of Piano Guys much like booking a solo violinist will not get them the effect of Lindsey Sterling. The reason being that popular string players though they may perform as soloists, are playing along with backup music to enhance the overall sound. Rarely will clients be content with a solo cello playing Ed Sheeran's "Perfect" all by itself. All of that being said, trying to connect with other live accompanists is a GREAT asset. Beginning to build a library of accompaniment tracks is also a great investment in the event that your accompanist isn't available, you still have an alternative option rather than turning down the gig altogether. Singing with tracks will take time commitment and investment in practicing with the technology and prepping to make sure all the kinks are worked out. The worst is to invest money into technology, but not invest the time and then the technology ends up distracting from your talent as a performer.