The main theme could be change. The 'turn of the tide' often implies a shift in a situation, like in the story it might be about a change in a character's fortune or the mood of a community.
I'm not sure exactly who the main characters are without reading the story. But they could be people living in a coastal town since the tide is involved. Maybe a fisherman who depends on the tides for his livelihood.
There could be a hero - type character, let's call him Jack. He might be in a small fishing village where the economy is bad. Along comes a 'turn of the tide' situation, maybe a new fishing technique or a discovery that changes the village's fate. And of course, there may be other supporting characters like Jack's family and friends who are also affected by this change.
It could be about change. Often in stories, the 'turn of the tide' implies a shift in a situation. So perhaps it's about a character's change in fortune, like from bad to good or vice versa.
The following are some recommendations for novels with the theme of turning the tide:
1. Book of Troubled Times, Author: Ji Cha
2. [Spirit Realm Walker] by Xiao Langjun, a newspaper seller.
3. The Tang's Table, by Jie and 2
4. King of the Familiar, Author: Light Spring Flowing Sound
5. Fairy, Please Listen to My Explanation. Author: Mi Tian
These novels might suit your preference for the topic of turning the tide. Please note that these recommendations are based on the search results provided. There may be other novels that are suitable for you.
Since I don't know the exact 'Turn of the Tide' real story, generally key elements could be a starting situation that was not favorable, a catalyst or event that caused the change, and then the new situation after the turn. For example, if it's a business story, the starting point might be a company on the verge of bankruptcy, the catalyst could be a new product idea, and then the new situation is the company becoming successful.