Can I salvage this relationship?

After being together for 8 years I feel like the spark between my significant other and I has burnt down to a small flickering flame. I’ve tried everything I can think of to rekindle it. Small gesture of kindness, getting him just because gifts, lost a few pounds, dressing sexy, being more spontaneous in the bedroom, and just flat out telling him that I need more of his affection and attention. All to no avail. This has been going on since I found out I was pregnant in 2018. I actually wrote a post about it then. It’s 2021 and things have not changed much. We have a beautiful 3 year old daughter. He’s a good father and he’s been in school working on his doctorate degree for the last 3 years. He graduates next month. I keep telling myself that this change is because of him being focused on his education and career and that it’ll get better once he’s done. But honestly, I’m afraid that it won’t. I fear that for whatever reason, he’s just not into me like he used to be. Some men become bored and complacent easily. It’s so hard not to compare things to how they used to be between us. I do it constantly. Thinking how he used to react when I looked nice to how now he’ll barley looks up at me now. It hurts. I don’t know what else to do and I’m tired of feeling as I’m fighting for this alone.

But then I say what makes you think you won’t leave this relationship and get into another one and 8 years later be in the that same spot with someone else!?

I’d appreciate any solid advice.