2024 Hyundai Santa Fe Limited

I've been shopping for a 2024 Santa Fe Limited for a couple weeks now. It's all been over the phone, text, or email. I have reached out to around 10 dealers to get their best OTD offer. I have watched probably hours of "What to do and not do while negotiating" videos and I just feel like I'm always coming up short. I feel like I am giving them unreasonably low offers/like I'm incompetent with this stuff. I understand there will be a fair amount of pushback on the pricing since they want to sell it for as much as possible. And when I do get an itemized pricing breakdown, I can't spot any room to haggle. They don't include crazy add-ons, accessories, etc. The pricing is almost always the Initial Price plus the "Dealer Fee", License/Title Fee, Doc Stamps, and Reg. Fee. And of course State taxes which neither I nor the dealer can change. I guess I'm wondering what I'm doing wrong. Every OTD price I get is $39k-$42k and I would like it closer to $37k (ideally $35k) OTD.

What (if anything) am I doing wrong and what can I improve?