Hi!
1. Do inventarisation of instance.
2. Read some upgrade matrix, release notes of functionality.
https://confluence.atlassian.com/adminjiraserver/upgrade-checklist-966063320.html
https://confluence.atlassian.com/adminjiraserver/upgrade-matrix-966063322.html
3. Review installed plugins
4. Take one of strategy.
4.1. Upgrade version by version on exist instance
4.2. Install a new instance and do export/import
4.3. Install a new instance and migrate of active projects and keep old one on old Jira instance
Hope it helps
Cheers.
Gonchik Tsymzhitov
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