Create a button in the navigation bar on the right

ganeshsanap Yes, I'm trying to add this button for all modern pages.
I use SPFx Application Customizer and find the class (actionsWrapper-58) I need in order to add a new element (div with class new-link_box) to it.

const articleDiv = document.querySelector('.actionsWrapper-58');
const elem = document.createElement('div');
elem.classList.add('new-link_box');
articleDiv.insertBefore(elem, articleDiv.firstChild);

But, sometimes when I reload the page, this class can change from actionsWrapper-58 to actionsWrapper-90, in connection with this, the button does not always appear.

I found out that only these two class names alternate. Now I want to somehow search for this parent block, not by the entire name of the class, but only by the part up to the numbers (actionsWrapper).