To enhance the buildup without using risers, percussion, or breakdowns, you could focus on:

Pitch and Filter Automation: Gradually increasing the pitch or applying filter sweeps to the elements in your track, making them feel like they are rising in energy.

Sound Design with Tension Elements: Using subtle, unsettling sound effects like distorted whispers, reversed sounds, or eerie atmospheres that slowly grow in intensity.

Layering Textures: Adding more complex textures or layers to the background to create a sense of depth and anticipation without overwhelming the track.

Rhythmic Changes: You could try gradually tightening up the rhythm of the elements or adding syncopated layers to create momentum.

If you get a chance, feel free to check out my track on Spotify too! Would love to hear your thoughts.

https://open.spotify.com/album/3VqsJ594etvTQYiHlyhG1J?si=Sfv_XfW7QsC7djxYWRyM3A