Exchange Server 2013 reaches end of support in next 60 days on 11th April 2023, its now time for your Organization to move your Exchange Server On-premises to a supported version and Microsoft has provided detailed guidance on the same.
If you are an Hybrid Organization ensure you are updating your On-premises environment to be in supported state for hybrid.
If you are planning to migrate your Environment to Exchange Online you have detailed guidance on the same including detailed steps to decommission the last Exchange 2013 server.
You can access the guidance here: Microsoft Exchange guides
Access the Exchange Team blog post here : Exchange Server 2013 End of Support Coming Soon
New Blog post here: Exchange Server 2013 End of Support Approaching Fast
Latest Blog post here: Exchange Server 2013 Reaches End of Support Next Month