How to diversify the economy of a region?

I live in Dalmatia, aregion in Europe that is super dependant on tourism and there is very little actual economy, how can this be fixed?

For context, in Dalmatia, the area between Split and Zadar has the population of around 500k people along 150km of coastline as well as a decent university.

Is this enough people to attract investment and develop a strong industry in things like tech?