Hello @kylie__wyote
In addition to @TurboTaxGinette's answer, ... I also recommend you visit this CRA's web page to filter codes using keywords relevant to your profession:
https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partners...
Hint: When I typed "psych", the web site returned 621330 and 621110. Since only you know precisely the nature of the services you offer, I'll let you decide on the most appropriate code.
Have a nice day!
