It would be appreciable if you present: “Although most people like summer, my favourite season is autumn. Since it is not too hot,I often go for long walks.” instead of presenting: ” Most people like summer. My favourite season is autumn. It is not too hot. I go for long walks.”
Here, these conjunctions are crucial in achieving a better score.
The area of grammar you need to concentrate here is subordinating /adverbial subordinating conjunctions.