how much international stock to have vs domestic stock is almost a religious war at this point. Pick whichever you like (I like 0% international personally), and then stick with it. The most important variable will really just be the Equities vs Bond ratio; and even that is nibbling around the edges unless you’re making 1000basis point changes (shifting from 10% to 20% in your case). And stick with that too unless YOU have a reason to change it, not because you think the market has a reason for you to change it, such as becoming more risk averse due to age, life circumstance, etc.
ETA: FWIW at 30yo, even 10% bonds might be unnecessary. But that depend on you and your risk tolerance and when you expect to need that money.
One can’t find the button to push. The other pushes every single fucking button they can find.