You will not always be motivated. There will be days, weeks, months where your motivation will run low.
This is when your true colors show.
When motivation is gone, dedication kicks in. Dedication is what will get you to your goals. Dedication is what will keep you going when you're tired, you're busy, you just don't feel like it.
If there's anything that this fitness journey has taught me, it's that dedication > motivation. So, accept that now and practice dedication. This will translate into every part of your life. You'll notice. Others will notice.
So this doesn't mean you can't make an effort to re-discover that motivation; here are a few tips to find some of that motivation.