As Now Microsoft Exchange 2013 End of support very soon, Microsoft will no longer provide the following services to this version of Exchange Server-

No more technical support for any kind of error in the software.
No longer bug fixing, and it may create usability and stability issues.
No longer security fixes to remove the vulnerabilities in Exchange 2013.
However, due to the reasons listed above, it is strongly advised that you move from Exchange Server 2013 as soon as possible, though Exchange Server 2013 will still function after this date. The time has come to prepare for migration from Exchange 2013 to Exchange Online or Exchange Server 2019.

You currently have five months to plan your next set of actions related to Exchange 2013. There are the following options that are available to you.