There's so many ways to fund an open-source project these days.

Should small project stay in your spare times and don't bother to be funded ?
Should you engage user and ask for small donation (donation, patreon ...) ?
Should you seek larger company and offer visibility for sponsorship ?
Should a project fund itself by its own financial choice (subscription, paid plan ...) ?

If you've gone thought it yourself or witness a great way to manage it, please share how it goes.