We have a few SQL servers that need to be upgraded before they go end of life. We are looking to do inplace upgrades. Below are links from Microsoft about the process. Have you even done an in place upgrade for SQL, what was your experience? Did you run into any issues?
In-place change of SQL Server version – SQL Server on Azure VMs | Microsoft Learn
Upgrade SQL Server – SQL Server | Microsoft Learn
Upgrade SQL Server to SQL Server 2019 – SQL Server | Microsoft Learn