Guys, if you don’t have enough money to donate or are unable to use your money internationally (like me), you can simply go to arab.org and click daily for free. Each click will send money (Lebanese Pound 1 per click. This organization is based in Lebanon and works with the UN) through ad revenues to UNRWA in Gaza. Besides Palestine, you can also support other causes in the Arab world for women, children, refugees, the environment, etc. Therefore, make sure to go to this site on each of your devices and click everyday.
(EDIT) You can also use different kinds of browsers on your devices to give more daily clicks. I've tried this with Google Chrome and Microsoft Edge on my PC. Now, I'm downloading Mozilla Firefox to click again.
(EDIT 2) Using the private mode of a browser after you use non-incognito browsing also allows you to click more in repetition. You don’t have to wait for a day to be over to click again with private browsing.