People are motivated by hope. A common reason people struggle to feel motivated is because they have lost hope that they can ever be different. Where a little opportunity, little progress and little resources are perceived. There's also usually little hope. If you've ever struggled to make changes and failed, or wanted to make changes, but didn't see any way to do it, you probably ended up with a sense of hopelessness, that dashed your dreams, then you simply gave up because there seemed to be no reason to keep trying. Well, the best way to renew your motivation is by choosing to be hopeful again, yes, you can choose to be hopeful.
Open your mind to possibilities that you may not have considered or seek help in brainstorming and getting unstuck. new options and possibilities always produce new hope. Where there is hope. There is always a chance to succeed.