The best alternatives to What should I build? are The 25 Days of Ideas, 5 Ideas Every Day, and Hatchli. If these 3 options don't work for you, we've listed a few more alternatives below.
Everyone has startups ideas. Most are pretty worthless. Post post your startup idea and get honest feedback from other makers before you start building your product.
IDEATOSHARE is a creative community where people can share their crazy business ideas or pain-in-the-ass problem they face. The community’s goal is to come up with solutions for these issues! You can use these ideas, build a team, discuss with others etc.