Hello,
Your advice always helps me a lot and I take it into account 
I need advice this time too 
I have the following versions of Jira Server -
Jira Soft 8.13
Jira Service Desk 4.13
and Confluence 7.13
I want to introduce new versions and what do you recommend me to switch to new versions -
Jira Soft 9.0
Jira Service Desk 5.0
and Confluence 7.18
If on the last long supported versions
Jira Soft 8.20
Jira Service Desk 4.20
And Confluence 7.13, that is, I will not change it
I would also like to inform you that I am planning to move to a data center within a year