Here are a few suggestions for your next trip from Pali Lula

In 4 hours, you can reach Sofia, Pleven.

In 6 hours, you can reach Pernik, Blagoevgrad, Veliko Tŭrnovo.

In 7 hours, you can reach Plovdiv, Craiova.

In 8 hours, you can reach Ruse, Shumen.