I have the same challenge! I’m ever procrastinating the actual creation of new art. I’ve tried to reward myself for finishing artworks. Sometimes chocolate, sometimes with an outing, or lunch at a restaurant if I can afford to. Sometimes it works, sometimes it doesn’t - essentially it would mean I need self-discipline to start with, e.g. not to eat the chocolate before doing the work!
My procrastination is often about fear of failure, not wanting to mess up really nice paper. So I make sure that I have more paper than I actually need, and I tell myself that the artwork could go into my ‘scrapbook’ if I don’t like it, or if it’s on wood I can just rework it/cover it and start again.
My best strategy however is to get up a little earlier and make something without doing ANYTHING else first. No coffee yet, just jump right in. I’m fresh in the morning and my over-critical side seems to take a bit longer to kick in (around 10am if I’m not mistaken).