Streamlit Frontend but Backend where ?

I have been using streamlit since a long time but never worked with backend.

What are my most convinient options if i have to deploy my fast api backend so that my streamlit can interact with it.

I tried Render but the free tier resources is not enough for the backend.
I also tried Huggingface Spaces but it is too complex for me and may take time for me to implement it using docker.

I want something quick and convinient to showcase my work.