Yes, they need to give incentives to the gamblers who prefer to use BFG over other cryptocurrencies for gambling. If you start giving free spins, deposit bonuses, and other stuff for using BFG, the value of this token will increase. It could be like Example: "Deposit 100 BFG, get 120 BFG to play!", giving 20% extra amount to gamble will be enough to generate a demand for it. Staking BFG can be another good option for those seeking passive income. They can even offer token burn from casino profit to reduce the supply.
I don't consider 20% deposit directly in token is good example of utility. It is like creating more inflation of the token, surely I have yet checked about total supply of BFG token, but it can be feeling of people who are exposed to this promotion a first time.
Creating more utilities, making this token deflationary are realistic support and hype will come but the company have to assess all possible effects on their business finance, and not only focus on BFG token which is only one part of their company.
Buy back and burn token requires so big fund for execution and it requires a long time too, and the team have to consider this idea very carefully and might not see it helpful. It can help supporting the token with buying force from the company and help the token maintaining its price, but to soar to the moon, perhaps it needs more utilities and general good momentum in cryptocurrency market especially an altcoin season.