Hi @HopefulSpeechie2018! Just like you, I am also currently applying to Western, UofT and McMaster. From listening to other grads and profs, I would say the KEY thing to keep in mind when writing your statement of intent is to make yourself stand out from the rest. What qualities, experiences, academic accomplishments would make you competitive? For the academic section, be sure to include any scholarships and/or awards as they do take that into consideration -- so don't forget about that! Try explaining how your volunteer experiences have led you to feel so passionate about pursuing SLP as well. You might want to mention about a specific population, disability, therapy technique, etc.
Make sure to find at least 5-6 people to edit your final SOI as you want it to be error-free and immaculate.
Best of luck