Since December 2018, the University Library has a campus license on Zotero, which means you can store unlimited references there. Instructions on exporting your library from RefWorks to Zotero are available here (guide from Princeton University Library).
We understand that it can be a challenge to change well-established tools. Please do not hesitate to contact us if you need support in exporting your reference library to another application, help selecting a new application or getting started with Zotero. 

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