When you are trying to change someting in yourself it's better to focus on the change itself rather than setting goals.
Setting goals and trying to reach them might work, but I find myself often returning back to old habits after reaching the goal. It's a small victory, but doesn't resolve the issue. I haven't changed.
It's hard to keep yourself going without an aim, so goals have their purpose. When working on a change I'd however rather call them milestones. Something to work towards, but not the end destination. If you want to change you need to start, but there won't be the end. You just need to keep going.
Milestones can be anything. A week, a month, 100 days, a new record streak, 10 kg. Depending on what you are trying to archive and how far you are. There is no point setting your first milestone too high when you are just getting started. You need those victory moments more often then to keep yourself motivated. Just keep increasing them as you go so they also don't lose their meaning.
When you finally thing you are actually changed it's still good idea to keep count. Remember how many years ago you started the change, how long it took and most importantly: who you were back then and why you wanted to change. And never stop.