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My checklist would be:
Download Microsoft® Data Migration Assistant and search for possible incompatibilities with SQL Server 2019.
On a test environment upgrade to SQL Server 2019. At this point everything should still be the same because your compatibility level is still set to SQL Server 2014.
Change the compatibility level of 1 database to SQL Server ...
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This is not really advisable. Install and validate your WSFC then install and test the clustered SQL Server instance on each WSFC node. SQL Server can be really picky about installing to additional nodes of a WSFC cluster and you could easily find it failing leaving you with a one node cluster.
Also storage has a level of indirection for a cluster with ...
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