POC projects with DBT

Hi community, I am just getting started with dbt and learning it. I learnt dbt is an open-source ELT tool which takes care of Transformation part. I would like to demonstrate the same by developing the projects (one using dbt and the other without using dbt) which will prove that dbt is more cost efficient than any cloud services available. The primary objective of this project would be to showcase that using dbt would reduce my cost. Let it be in snowflake or Databricks, can you please help me with any of the ideas?