Re: Side path gap due to overtime soil sinking- What is best to fill the gaps ?
Welcome to the Bunnings Workshop community @iamtheroot. It's great to have you join us and many thanks for your question.
I don't believe there is any reason to cut the concrete and redo it.
You could mix the correct colour oxide with cement and fill the gap. However, it looks like it is standard concrete which has been painted. It might be easier to fill the gap with a suitable paintable and flexible filler like Sikaflex 11FC. You could then repaint your concrete and give the whole area a spruce up as it appears the paint is coming away in other places.
Please let me know if you need further assistance or had any questions.