I have a U.S. passport expired in 2022 but there are only 7 blank pages left.

I plan to visit the following countries in September and October 2018.
1. Flying from the U.S. to Bucharest, Romania and transit in London. (1 Stamp)
2. A day trip by car from Suceava, Romania to Ukraine and back to Suceava, Romania. (4 Stamps)
3. Flying from Bucharest, Romania to Sofia, Bulgaria. (2 Stamps)
4. Flying from Sofia, Bulgaria to Istanbul, Turkey (I got an E-visa on the internet.) (2 Stamps)
5. Flying from Istanbul, Turkey to Dubrovnik, Croatia. (2 Stamps)
6. A day trip by car from Dubrovnik, Croatia to Mostar, Bosnia and back to Dubrovnik, Croatia. (4 Stamps)
7. Driving from Zagreb, Croatia to Slovenia and back to Zagreb. (4 Stamps)
8. Flying from Zagreb, Croatia to Amsterdam, Netherlands and spending a night at AMS. (2 Stamps)
9. Flying from AMS to the U.S. (1 Stamp)

Two blank pages are required for entry and exit from Netherlands.

I can skip # 6. If I do that, do I have enough blank pages for the entry and exit stamps?
Should I renew my passport? I am leaving to Bucharest next Monday and I just found out about the passport stamps. If I have to renew my passport, I have to drive 3 hours one way.

Thanks.