Filing taxes in Canada is relatively simple compared to the USA. See the site for various options, but try to find ones not operated by American firms such as H&R Block and TurboTax.
From a cursory search, TaxTron, GenuTax, Better Tax appear Canadian. Many are Pay-What-You-Want model.
If you have a complex tax situation and/or can’t file online, and/or don’t want to do the paper return yourself, consider seeing an independent Canadian accountant.
You can also file with just a phone call. There are a couple of restrictions so it’s on an invite basis still. I found out about it after I filed so I might give it a whirl next year; if I remember.
https://www.canada.ca/en/revenue-agency/news/newsroom/tax-tips/tax-tips-2021/file-my-tax-return-by-phone.html