Were you banned on Reddit browser or the mobile app?
If it's mobile app it'll be difficult to spoof your fingerprint since reddit app does very intrusive device hardware profiling alongside the usual browser fingerprinting.
If it's browser based, then:
1. simply switch to a multi-login privacy browser like incognition
2. Get new fingerprint/useragent for a new browser profile
3. Open the browser and do some basic searches here and there to create a cookie profile (make sure the privacy browser is recording your cookies)
4. Get a good residenial rotating 4g proxy
5. add the proxy and create a new browser profile with new fingerprints, add the cookie file from previous profile, and create your reddit account.