Is there a shortcut key combination to reset subsequent characters to normal position after subscript or superscript characters?

[wekort]

revert from subscript/superscript to normal position

[dajare]

• CTRL-SHIFT-P toggles superscript;
• CTRL-SHIFT-B toggles subscript.

You can also use those key combinations to modify existing text, again as a “toggle”. Hope that helps!