There's a technique that works on toddlers that you can apply to yourself.

If you want a toddler to do X, don't ask them "do you want to do X?"

Instead, ask "do you prefer to do X in way A or way B?"

Then they feel like it's their choice and they got their way.

Now applied to yourself: instead of trying to force yourself to do something, ask:

Of all the things I have to do, which one do I feel like doing today?

It may not be the most important thing but it's better than nothing.