What update is available for the macOS Sierra?

Back up your data, check the application compatibility table, click here, and then on the download link for a more-recent OS. Sierra can be updated to 10.12.6, and any Mac running it can be upgraded at least as far as High Sierra.

Catalina and higher won't run 32-bit software; if you choose one of them, use Go64 as well.

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Depending on the vintage &/or build year model of Mac, there might

be a later version macOS upgrade, perhaps to High Sierra, & beyond.

An upgrade may not require additional hardware, if compatible.