Isn't that what the drugs and booze are for?

In my experience with writers and artists I have seen a few additional less classical methods.

1. Cultivate arrogance. Convince yourself that everything you do is Important and interesting most people can't tell the difference between good and bad art and if they could they would in all probability chose the bad. So tell them you are a genius and mean it they can't tell the difference anyway and will believe you. Bonus even if they don't you still do.

2.Blame it on someone else. I don't mean write pseudonymously (although that is a time honored method of ego removal and self protection) but buy into the mythology of the muse / "thank you Jesus for this gangster Rap album". Place the creative burden outside yourself. You don't get the whole credit but then again it was not all your fault.

3. Don't give a shit. Let the market decide. Tell your self a good piece of work is one that sells a bad one is one that doesn't. I find this one a difficult fit for poetry but then again it is kinda punk rock.

4. Pull the Sung Dynasty trick. There is a method in ceramics where you have a gorgeous subtle red made by suspending minute amounts of copper in the glaze It is really tough to get it to work the reduction has to be just right, the copper is fugitive at the temps required etc. Even modern potters can get it right most of the time with modern equipment. But there are tons of perfect copper red ware from the Sung Dynasty. What is the secret? No knew until a few years back archaeologists found even more tons of broken imperfect ware. The Chinese potters were getting maybe 13% good stuff and chucking the rest. If only 1% of what you write is good then write 100 times as much stuff.

5. Own it. At least self-loathing is an honest emotion.