I've been working with my wife on Uruky [1] for a couple of months, now. It's a EU-based (early) Kagi [2] alternative (privacy-focused and ad-free search with domain boosting/exclusion rules).
We've been using it with friends and family semi-successfully (hashbangs always work if the results aren't satisfactory).
It's really difficult to get bigger indexes other than Mojeek and Marginalia to want to work with us and improve the results further, so that's something I've been researching more, lately.
If you're interested in trying it for a few days and are a human, reach out with your account number and I'll give you a couple of weeks for free. We're pushing improvements daily.
[2] https://kagi.com