Cello is rarely used in bars now, and dj music accounts for the majority.
So it is better to advertise as a family tutor such as cello tutor or teach music theory.
Naxos was right. The music store is also a place to go.
If you have confidence in music theory or professional courses, you can coach art students and take the college entrance examination for music direction. Some students are weak in music theory.
Of course, I only offer some possibilities here.