Ask for donations vs ask for investments

I have created this site: https://crypto4ngo.org

Project pages at the site ask to buy tokens (our own new cryptocurrency) by sending Ether (a kind of cryptocurrency) to a certain Ethereum address.

I want to add listing BitCoin addresses for project pages.

So we have: Ether donations are rewarded with tokens send back to one who paid. BitCoin donations are not rewarded by the system.

Now: How should I ask for donations or for investments? Should I ask the user to donate or to invest (in the case of Ethereum addresses)? Should I ask him to donate BitCoin but invest with Ether? or should I ask just to donate (and be rewarded)?

The thing I want: A clear wording at the top of the project page which maximizes the sum of BitCoin and Ether payments to us.

I am awaiting both ideas how to ask BitCoin donations (which are not yet asked at this site) and how to improve existing plea for Ethereum investments.

This is an example of a project page: https://crypto4ngo.org/project/view/1

Also note that this Ethereum investment follows a certain formula. Where to put this formula (or a link to it) to attract investors?