Crowdfunding isn't generally a viable last resort for a project that is expected to be a commercial failure. If people won't buy the ready-to-play game in sufficient numbers, how can you expect them to buy the promise of a game in 2-5 years, maybe? If you were hoping to prop up the crowdfund yourself with your private fortune (I understand venture capitalists are having trouble finding projects to invest in these days, maybe that's you?) maybe you could get in touch with the management and explain that you want a sequel so bad you're ready to drop 2 million on it tomorrow.
All that said, I feel like they absolutely screwed the marketing up on this, which is 100% a paradox problem. They highlighted "it's the grimdarkest grimdark that ever grimdarked: it's exceptionally grim and outrageously dark!" and no one cared (I sure didn't - I bought it on sale years late because I was up past bedtime and randomly read about the actually-compelling aspects of the game.) If every ad were just an explanation of the spell sigil system I think it would have outsold PoE (which I only played briefly on a friend's system, and it wasn't BAD, but I didn't need to buy my own copy to keep playing it or anything.) But even though people associated with Paradox have publicly admitted it was a marketing failure more than anything else, trying to convince them that an alternative marketing approach would actually do better is a hard sell. At a minimum if we got an in-universe "sequel" it would probably not be called Tyranny II, they'd want to do as much as they can to salvage the system and lore while distancing themselves from the marketing stink of the original.
