Some things that need exploring (aka my suggestions):
1. Implement sales tax (could be just a few percent).
2. Implement progressive tax for high profit companies (e.g. >HKD10,000,000)
3. Reduce profits tax for low profit companies (e.g. <HKD1,000,000).
4. Re-peg the HKD.
5. Abolish stamp duties on securities/shares.