Most Important Elements of a Grant Proposal
The following are often helpful:

Most grants are geared to solving important problems with innovative solutions. These solutions should be models that can be used by others in similar circumstances. Therefore, the more important and more common the problem, the more innovative the solution, the more readily this innovative solution can be used by others, the more likely you will get funded.

There are exceptions, for example, in the arts. Also, when a funder asks you to provide a specific service, your application must demonstrate your expertise and experience in carrying out what they want done. These do not have to be innovative.