Gazafunds actually deals with this anxiety and makes a decision for you if you want. Their home page has a spotlighted fundraiser and the code consider things like how close the gfm is to finishing, when the most recent donation is, etc. So it’s randomized to help as many people as possible.
There’s also @helpgazachildren which if you donate, you can help multiple people at once since it’s a whole mutual aid fund, or at least close to it. Hussam distributes money to people who need it when he’s asked.