Like a pantomath but without being an expert in each subject.
A pantomath (pantomathēs, παντομαθής, meaning "having learnt all", from the Greekroots παντ- 'all, every' and the root μαθ-, meaning "learning, understanding") is a person whose astonishingly wide interests and knowledge span the entire range of the arts and sciences.
I don't think this question is a duplicate of Is there a word for describing people who know many things but superficially? as "not specialised" isn't a synonym of "superficially". Also the referred question has many answers not related to this one in terms of content and quality (as this one already has), and has been marked as a duplicate of What is the word for a person who does different jobs?) so it won't make sense to mark this as a duplicate.