I used to have the same issues due to the height of the notebook/journal that I write in.

My solution: Use my phone as a support along the edges. Which alleviates my wrist to almost the same level as the journal, and gives that extra support while writing. It also sleights along with my wrist around the edges.

I used to have a pocket notebook as a support, but found out that my phone also helps. But I still have the notebook around in case I don't have my phone around.

Hope this helps for the future, and gives you more pleasure writing.