Most of the nonprofit fundraising ideas you will find online were written by companies that sell fundraising software. That is not a conspiracy, it is just who has the budget to publish. But it shapes the advice.
Those lists quietly assume you have a donor database, a staff member to run the campaign, and a little money to promote it. If your organization is four people who meet on Tuesday nights, most of that advice does not apply to you.
Here is the short answer before the argument. The nonprofit fundraising ideas that work without staff are a structured ask from your own board, a monthly giving option, memorial and honor gifts, one repeatable local event a year, and a direct email to a community foundation. The rest of this is detail on