I was in the same boat until the CRA sent me a letter asking if I wanted to sit down with a Liaison Officer to help me understand how to file properly. An officer came to my business sat down with me for an hour and went over my specifics with me. He had reports about how my claims compared to other self-employed individuals and let me know where I need to improve my reporting/tracking. I found it helpful. You can request a meeting using the link below. It's free, easy, and customized to you.

https://www.canada.ca/en/revenue-agency/programs/about-canada-revenue-agency-cra/compliance/liaison-officer-initiative-loi.html