Credits and deductions

Married but I assumed because I'm the lower income parent that it would be on mine. Children were 1,4 and 6 at the time. Is this something I should look into from previous years? I just assumed I wasn't able to use it all for some odd reason. I looked at 2021 & 2022 assessments and both are similar. I'm a Healthcare professional - little knowledge of income tax lol.