I wanted to try my app on iPhone 6 with iOS 10.3.3 but I couldn't find iOS 10.3.3 in simulators

any ideas are welcome
Unfortunately you can't download it from this window, as Apple does not release/provides simulator for each version/subversions of iOS.
Here I've simulator list with Xcode 9.3, Component window. It seems apple has not provided simulator for 10.3.3.

You can also add/find a simulator from Xcode Target:
Open simulator list against your Xcode target and Add Additional Simulators...

Switch to Simulators and click on +

Select Device Type, iOS Version and Create simulator.

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