Where to reinvest my retirement funds (currently in various stocks)?

Hello, any advice would be appreciated. After leaving my previous company, they issued me a check and I invested that into various stocks through Fidelity (example Nvidia). My initial investment has now tripled and I am done with the risk. What can I shift my money into, that won’t hit me with a tax burden and is also low risk? Sorry if this has been asked countless times, but I don’t know if the investment firm plays a factor, and all the other variables I might be missing. Thank you all for yo

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