Go abstract. Invent your own style of 'automatic painting'. Paint straight from your subconscious. Don't think. Just paint. It will look a mess at first but if you can lower your inner critic (fuck it, destroy him altogether) for a little while, you should start to see the merits. The beauty and purity of form and formlessness. Things you pick up from doing this for a while will help your normal work immensely. Try it, you may find it incredibly freeing