As many said, a stable alliance with Russia is vital.
And an early death of Bismark would also help.
But with so little time or better such a late POD the Austrian-Hungarian Monarchy has only one chance IMHO.
It needs to become an industrial powerhouse that rivals England and Germany.
It is industry and innovation that could make Austria a superpower.
That would require a big change in attitude towards new ideas esp.from the Emperor Franz Joseph but if a little ASB is okay...
If the KuK Monarchy makes use of its resouces and industrialises on a grand scale (like Prussia/Germany did or even more) and inventions in engineering, medicine and chemistry become Austrian ideas it would be a superpower within two generations, even without colonies.