Well, perhaps the theme of memory plays a big part. 'human acts a novel' might be about how people remember events, especially traumatic ones. It could also touch on the theme of identity. As characters go through different experiences, their sense of self might change. For example, a character who experiences a great loss may have to re - evaluate who they are.
One of the main themes could be human resilience. In many novels, characters face various hardships, and this might be the case here too. They might endure physical and emotional pain, yet find ways to keep going. Another theme could be the exploration of human nature. It could show how people react differently in difficult situations, some with kindness and others with cruelty.
The main themes could include the power of relationships. In the context of a novel, characters' interactions with one another can shape their lives. Friendships, family bonds, or even enmities could be central to the story. Also, the theme of social change might be present. If it's set in a particular time period, it could show how society was evolving and how the characters were affected by those changes.