Didn't account for all that traveling, did you? (It is hard to predict the next 10 years.)
Despite what the internet tells you, it is not possible to add extra pages to your passport. The confusion stems from the fact that it used to be possible before 2016, but no longer is.
Straight from the U.S. Department of State in their FAQ:
Can I get extra visa pages for my passport?
No, you cannot. Applicants who need additional pages in their valid passports must obtain a new passport by mail. Applicants within the United States may choose a 28-page or 52-page book.
Instead, choose to renew for a 52-page passport instead of a 28-page passport (there is no extra cost).
If you've exhausted a 28-page passport, you will have to apply for a new passport. Thankfully, a U.S. State Department spokesperson has confirmed to us it is possible to use the new online application system if applicants meet the qualification.
Just make sure you get those extra pages in this time 😉