Here are a few suggestions for your next trip from Radko Dimitrievo

In 2 hours, you can reach Shumen.

In 4 hours, you can reach Veliko Tŭrnovo.

In 5 hours, you can reach Varna, Burgas, Pleven, Sliven.

In 6 hours, you can reach Stara Zagora, Ruse, Dobrich.

In 8 hours, you can reach Sofia, Plovdiv.