People don't search for your charity by name until they already know you. They search for the need: “help with debt”, “support for carers”, “dementia advice”, “volunteer near me”. The organisations that answer those searches on Google earn the trust, the donations and the referrals - and most charity websites, built around the organisation rather than the person searching, never appear for them.
The reason why SEO for charities is such a strong investment is that the demand is already there and the competition is weaker than in almost any commercial sector. Charity websites tend to have exactly what Google rewards - genuine authority, press coverage, links from councils, universities and partners - and almost none of it is put to work. Proper charity SEO is often less about building something new and more about pointing what you already have at the searches that matter.