Here are a few suggestions for your next trip from Podvis(BG)

In 2 hours, you can reach Burgas.

In 3 hours, you can reach Varna, Sliven, Shumen.

In 4 hours, you can reach Plovdiv, Stara Zagora, Dobrich.

In 5 hours, you can reach Veliko Tŭrnovo.

In 6 hours, you can reach Ruse, Haskovo.

In 7 hours, you can reach Sofia, Pleven.