The Ethiopian budget comes from aid and loans from Canada, the U.S. and the European Union. As donor countries they can pressure the government to reform to make everybody safe by amending the constitution, respecting human rights and solving political problems through talks, through round table discussions, not through using weapons.
Abiy Ahmed cares more about his image and he cares more about being a peaceful man. He's been the Gorbachev of Ethiopia. He cares more about his image. If these donor countries pressure him to make reforms, and say, if not, then we're not giving him money, “Stop the war, and if you don't, then we won't give you money”, this kind of talk would have a big impact.