Here is a different approach to the overthinking.

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When you find yourself overthinking, simply notice it without judging yourself.

You might say to yourself, in a matter-of-fact manner, "Overthinking".

And then start to do something else, or go back to what you were doing.

Now, you might find that you go back to overthinking, perhaps many times.

When that happens, always respond in the same way:

--do not judge yourself
--say "Overthinking"
--go back to what you were doing

No matter how many times it happens: Don't judge yourself, just redirect yourself.

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If interested, try this approach for maybe 3-4 days and see if it helps you!