I think that first you need to make an advertising campaign for people who actively use the cards and at the same time are interested in cryptocurrency. This is a very effective way to attract the target audience.
Hello. My opinion is that they could give rewards for the use of the card. That is to say for each purchase that is made of more than ten euros can give a tip of 2GT.
According to the roadmap of the project, the cashback system will be launched a little later. Therefore, rewards for purchases must be integrated into the service 2gether.