website design: strategies to temporarily highlight a tab

I was wondering what strategies can be used to temporarily highlight a tab. By temporarily I mean change your appearance for a week or a month or so to notify me that something on that tab has changed.

Also, I was wondering how the strategy can differ according to the exchange rate. Maybe there is a great new feature that you want to emphasize a lot, although in my particular case I just want to give the user a little push.

In my case, the tabs look like the image below, but I'm happy to have a more general answer.

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I am not interested in changing the background color as it may confuse which is the active tab and I was thinking more in the direction of an asterisk or something like that.