I'll frame my answer around mutual funds since that appears to be the type of fund you're asking about.
When your fund closed to new investors, did it issue a new prospectus that might limit fund withdrawals? I've seen that happen furing my career. I;ve also seen funds that will only allow you to liquidate periodically, for example, quarterly. Be sure your fund hasn't imposed those kinds of restrictions on investors. If you didn't keep or don't have the lastest prospectus, call the fund company and get one. Amidst all the information in the material, there may be something you'll need to know.
As for "slow growing", I don't know what your time frame is or how long you've owned the shares. Healthcare has for the last several years been one of the better performing sectors in the stock market. Check your fund on morninstar.com against other healthcare funds. If the fund is earning returns equal to or better than its peers, you might want to keep it. If not? That's a wholly different decision process.
Good luck with your investigation.
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