If you are creating several minutes of TTS audio, do not treat the entire project as one huge paragraph.
Break the script into logical sections.
For a video, you might separate the hook, introduction, main points, examples, transition, and ending.
For fiction, separate the scenes and character lines.
For a podcast, generate different segments independently.
This makes revisions easier.
If one line needs to change, you can replace that section rather than rebuilding the complete narration.
It also makes synchronisation with video, subtitles, animations, and sound effects much easier.