My Own E-Currency

Create a market platform where the members could create their own currency.
Each currency should corresponds to the services they could provide, so for example 100 Melki Dollar equals to the creation of 1 yearly financial statement for a small company.
These currencies then traded in the site's market.
Reputation level increased every time the currency completed a circle (it's used to buy services from the creator). And the site will record the journey of the currency. A complete circle rating also considers rating from the costumer who ended the cycle. So every time a currency made a circle the costumer would be asked to give a rating about the service it received, whether they are satisfied with it or not. 
Every 5 or 6 years is the Jobel period when all currencies made 5-6 years ago expired.
Expired currencies will be recorded in the user's history, even though it would not affect the rating because they should not cancel each other for a reason I won't explain now.
If you don't like your currency to be let expired you could announce a buyback using new currencies or other people's currencies.

There are 2 ways that this system could be attacked:
1. Extortion at the end of the circle, this can be addressed by requiring the last customer to post the last transaction in order to be able to rate the currency.
Because the currency has it's history, the reasonable value of the currency could be roughly estimated by the public from the history.

2. Meaningless transactions just to boost reputation.
This can be addressed by tax, the site will have transaction tax maybe 1% or more in order to prevent meaningless transactions.  

How to optimize that fruit of good and evil

Create standards of what's acceptable and what's not while looking at yourself, past, present, and the future.
Standards that you set when looking at other people are viruses, on the other hand ones that you set while looking at yourselves are vaccines.

There's a reason why the whole bible is devoted to tell the story that God himself came to the world to become a forgiveness activist, and He put His own flesh and blood on it.

The standard you set while looking at other people, used upon yourself could potentially wreck you, on the other hand it's hard to make yourself laugh tickling yourself, it's hard to make yourself depressed out of standards made to take care of yourself.

12 Rules for life by Dr. Jordan Peterson is great, I value every money I spent on it.