1 tell her what is great about her.... find something.
2 bring her flowers, .... i give single roses
3 keep compliment her during the day.
4 try to stand close ... pretend you are trying to access something near her and touch her gently somewhere, like slowly rub you hand down her arm lightly
5 while touching whisper something sweet in her ear, a compliment or I LOVE YOU.
6 invite her to talk to you in bed,
7 message her gently and slowly

for romance it is a lot of work, iys not easy. when you first met you didnt remember what you did, then it wasnt work. we all change