Soft power follows hard power. If China wants to increase its soft power then it might have to wait for another 10 years.
It needs more tier 1 cities, poverty must come down, social welfare expanded, housing costs lowered, more hi-tech companies and innovative products, better governance, reduce corruption even more, pollution must be reduced significantly (very important).
Promote tourism, promote cultural exchanges, significantly increase basic science finding, promote science exchanges and forums.
Increase media collaboration, make policy making more transparent to the public and make mayor, governor, vice ministry appointments more transparent.
That's a long list and from what I see Xi is working on all of them except political transparency, so expect China's soft power to increase in the future