Solo 401k contribution via my 1099 if I also have a 401k via my w2

Hello all,

I receive a 1099-NEC as an independent contractor (self-employment) and  have been contributing to my solo 401k for a few years, last year I also got a W2 from another employer and I contributed 7.5k to my 401K at this place. 

My Question is - I have a net income of 22K with self employment. How much can I contribute as employee into my solo 401k and how much as an employer (profit sharing).

Thank you