I don't have one :p
I think at this time they have to take a massive gamble, offer the biggest promotion they have ever done, literally print free money. Even if they limit it to squad players only and not the top 200. Get the market moving. Get people out of holds. Some of the money will leave the platform. Some will stay and go into new buys. The soft, unhappy money will be gone and they can rebuild.
They reintroduce IS at a rate of say, 20% below buy price. Again, people will sell up, and go, or reinvest. And market bids should hopefully go in above that 20%.
Both ways are risky and will cost them a lot. But I don't see as they have much choice now. They have to do something.
They don't need a massive promotion just a promotion that will see prices rise, cause FOMO and it must coincide exactly on the day that sell orders come out.
I think a deposit bonus would do but it would need to be accompanied with a rallying message. Talking about advertising budgets and so on. Talk of 'the rise was cautious due to covid but will be reviewed as soon as market justifies it' and so on. Even if its fluff, just need people to buy into it and FOMO to kick in.