[thorin]

I'm in a similar situation as essentially an Oracle Developer with 20+ years experience. I have gradually worked with more db engines (Sql Server, Postgres, MySQL, Redis, Sqlite, Mongo, Couchbase, Snowflake) along with Oracle on projects I've been on. I've also explored more webservice development with java and .net core and mobile dev. I've investigated and used quite a few BI stacks too. I've worked with AWS and Azure.

All this has been related with my work to Oracle and it's helped me gain more of an Architecture type position now so I'd recommend growing your skills within the position they're already in AND if you feel it's necessary do some personal projects in your own time. I don't feel quitting work to study an only slightly related area would necessarily help unless you have a large amount of time/money to spare.

Whoever suggested Oracle will be around for a while is also right, so there will probably always be jobs if you can compete for them. For instance in the UK I'm aware that 100s of banks and most utility companies have used Oracle in core systems. A lot of these systems remain.