There is currently not an official SuiteCRM 7.x to SuiteCRM 8.x migration wizard ( a GUI), we are reviewing the schedule in the new year/January (2022). There is an unofficial tutorial to migrate if you are interested, but we would recommend that you had the confidence and some development knowledge to be able to troubleshoot (and provide us feedback on your migration) if it was required. I will also point out that you currently need to upgrade to 7.12.x before you migrate to SuiteCRM 8. 7.12.x contain scripts and updates specifically to handle upgrades to 8.
If it isn’t business critical to you I would suggest upgrading to 7.12.x for the time being and wait for the official wizard migration path to be released.
More than a year have past since this question was posted. Has there been any progress with this and is there a migration guide/tool available now to upgrade from 7.12.x to version 8?