Would a crypto tax service be usefully if I just bought and hold an average of 8-9 coins for the last 4 years?

Never day traded only bought btc with cad and held

Or bought btc with cad traded for alt and held..

When I cash out I would have to prove the capital gain between cad cash in -->btc-->alt-->btc-->cash out cad

I have not paid any taxes for the past 4 years I assumed it was only when you cash out... ( When you actually realize some gains, everything could go to 0 why would I pay taxes if I can loose everything tomorrow..)

Should I use a service like this NOW so everything is more organised and all my gains are calculated too make it easier in the future?