My advice would be
DON'T MAKE IT ABOUT THE ROMANCE.
Most romcoms suck because new writers build the story around the romance - which becomes one-note and runs out of steam by mid-point.
Most Hollywood romcoms allow the protagonist to pursue something
unrelated to romance, allow the romance to develop, and then put it in the way of the pursuit.
Like WORKING GIRL: Tess wants to rise in the company (get that corner office). She hatches a plan with Jack Trainer and falls for him - which becomes an obstacle to her getting that corner office.
In 10 WAYS TO LOSE A GUY you have Kate Hudson with a specific goal and Matthew McConnaughey with a specific goal. Those goals conflict and the two fall for each other.
The "romance" is really the byproduct of a bigger piece of plotting.
Screenplays
about the romance - ESPECIALLY BY NEW WRITERS - are often repetitive and meander - amounting to very little.
Romcoms are difficult to write because the script has to be funny
and must create a romance for which an audience can root. It's a double duty that most writers - even pros - can't pull off successfully.