You'll want to confirm your figures every year:

https://www.irs.gov/retirement-plans/one-participant-401k-plans

For 2022, the (employEE) elective deferral limit is 100% of compensation to a max of $20,500; there is a catch up amount for someone over 50 years old = additional $6,500. The EmployER nonelective share is 25% of the compensation.