How do I upgrade an iMac 21.5 inch computer w/ High Sierra 10.13.6?
Is there no way to upgrade my iMac computer mid-2011 model 21.5 inches?
iMac 21.5″, macOS 10.13
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Sorry, no. That is the last possible OS. See the following from Identify your iMac model - Apple Support
iMac (21.5-inch, Mid 2011)
Model Identifier: iMac12,1
Part Number: MC309xx/A, MC812xx/A
Latest compatible operating system: macOS High Sierra 10.13.6