The crowd-sale has been a bit disappointing in terms of interest, especially given how hot the market is, however

1. The crypto market is moving fast, so with no early bonuses, people won't rush to buy XFC until it's nearly sold out/the end of ICO.

Possible Idea: A retro-active bonus in the form of a free random card worth around 10% of your donation still available for the next 7 days.
This creates a time bonus and also puts at least one product in the hands of most of your investors which will help bootstrap the card market.
(Given the cheapest card is 1k XFC, XFC purchases of less than 10k XFC can be pooled together and put in a lucky draw.)


2. It's stated that any remaining ICO XFC will be sold for a minimum of 1350 satoshis, this limits the upside for speculators, therefore if it seems like a lot of ICO XFC will be leftover near the end of the ICO, investors may still be reluctant to buy.  

Possible idea: Show that any remaining ICO XFC will be sold in a staggered approach so that investors know there will not effectively be a huge sell wall at 1350 satoshis post ICO or commit to not selling below a higher price so that there's greater urgency to buy before the end of the ICO and more upside if you do.

Also as you say it may have been better to also promote XFC on a popular football forum over the last few months as opposed to just a crypto investors forum, the higher interest and player numbers would have got more crypto investors excited as opposed to the niche cross-over of crypto investors who are also interested in football manager games. I'm sure once you go to the football fans market near August, crypto investors will suddenly 'get it' when they start seeing the interest among football fans & XFC will explode in value.