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It would be possible to add a link that looks like some button by styling it with CSS to look like it, which when clicked would take them to the form.
If that would work for you please do let us know:
1. what is the form where you would like to have that 'button' on the thank you page?
2. what is the style of the button that it should have?
3. what is the URL to which the 'button' should point to?