Update

See if you can upgrade to 10.11, 10.12, 10.13, or 10.14, see sys requirements...

https://support.apple.com/en-us/HT206886

https://itunes.apple.com/app/os-x-el-capitan/id1147835434?ls=1&mt=12

https://support.apple.com/kb/sp742?locale=en_US

https://itunes.apple.com/us/app/macos-sierra/id1127487414?ls=1&mt=12

https://support.apple.com/kb/sp765?locale=en_US

https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12

https://support.apple.com/kb/SP777?locale=en_US

https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12

Go to Apple logo> about this Mac and click software update.

Mojave and later>it would lead you to the software update dialog in system preferences.

High Sierra and earlier> it would lead you to the App Store update page.

Great to see you helping out around here, keep up the good work! :)

Were you successful?