SUSE Linux Enterprise 12 SP3 Upgrade to SUSE Linux Enterprise 15 SP5

Dear Team,

Please advise urgent solution for SLES 12 SP3 Upgrade to SLES15 SP5. The EC2 Instances were bought as below

i-019964fe064a447d3 Application server with SAP Created on 23-10-2018
i-0c01cf34c23efe298 Database Server with SAP HANA Created on 23-10-2018

According to Product Lifecycle dates on SUSE Website for SLES 12 SP3

General Ends 30 Jun 2019
LTSS Ends 30 Jun 2022

So please advise since LTSS has ended IN 2022 then how can we get this upgraded to SLES 15 SP5 in place without having to create a new server from the AWS Marketplace. Our goal is to perform it in place as that would save lots of time and efforts at SAP level which would be beneficial in a production environment with very minimal downtime to our client.

Have you seen which was recently published?