Need to automatically go at the top of the page

I think your best bet is

st.markdown('# Section 1')

st.markdown('Lorem ipsum')

# As a text link
st.markdown('[Back to Top](#section-1)')

# As an html button (needs styling added)
st.markdown(''' <a target="_self" href="#section-1">
                    <button>
                        Back to Top
                    </button>
                </a>''', unsafe_allow_html=True)

When you click a Streamlit button, it will by definition rerun the app. You can observe if you manually type in a url with the section anchor that the anchor goes away as the page finishes loading.

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