Download, and install Microsoft PowerToys https://github.com/microsoft/PowerToys
Then open it, and in “General” settings, set “Always run as administrator” and “Run at startup.”
Then go to “Keyboard Manager” and set it up the same as in the picture below.
(Remap shortcut is valid in the picture. There is some weird behavior that needs to remap from Ctrl+Tab to Alt+Tab and not opposite as you think it should)
After that, go to “PowerToys Run” and set Shortcut to “Ctrl + Space.” This utility is the same as “Spotlight” in macOS.