The key here is domain authority.
The higher your domain authority the easier it would be for you to rank individual pages targeting individual keywords.
How do you raise domain authority fairly quickly?
The quick and easier approach would be to simply reverse engineer your competitors.
Find a list of your competitors, enter them into paid SEO tools such as SEMrush, find their organic keywords, and rank those keywords based on difficulty.
Filter them again based on monthly search volume and then load them manually, one by one, to see if the content you pull up using those keywords is closely related to the needs and interests of the people you are looking to market to.
Once you have filtered your keyword list, optimize your content based on what your competitors are doing, this is how you find your contextual keywords.
Write content that delivers on the search intent behind the keywords you are targeting.
If you rank enough of these your domain authority will go up, this is your signal to rank even more longtail keyword-driven pages.
Once your domain authority keeps increasing, start targeting more competative keywords.