There's a reason slow burn romance has such a devoted readership. It's about building something that feels earned.
What makes a slow burn work
The sweet spot is when you're simultaneously desperate for these characters to get together and satisfied by the tension of them not being together yet.
The enemies-to-lovers pipeline
If the "enemies" are obviously attracted from page one and just bickering, that's not enemies to lovers — it's flirting with extra steps.
A good slow burn doesn't make you wait for the payoff. It makes the waiting itself the payoff.