What I have found to help is taking some time out of writing to read through not only your own writing, but also the writing of others: whether it's posts in the same RP you've written to, other RP's, or even just books and other forms of literature. You may find something in your old writing you want to expand on, or become inspired by concepts and narrative tools that you noticed and realize might make for a fresh change of pace. The important point is to detach from what caused the original writer's block and shift perspective to beyond the block. Of course, take it with a grain of salt: I know it doesn't always work, but it's something to consider.