After the project later joins another exchange when doing IEO, I hope the project team can increase the Bonus that you give to IEO investors, I'm sure there will be more Investors interested in this project.
My opinion 10% bonus is big enough, they have thought of that. If giving bonus is too large for investors it will have very big impact when it starts trading
Creating a better bonus structure might help or even coming up with a unique promotion can also do the trick. Investors are enticed to invest if they get something in return.