Hey! I am wondering if anyone has any song recommendations for me to sing! I'm happy to sing any genre (apart from heavy metal), any decade or level of popularity:))

Hi! I am a singer and for a couple of years, I took a break from singing due to personal reasons which could not be controlled. I have recently gotten back into singing and I'm having trouble getting into head voice and trying to stay in it. I'm wondering if anyone had any tips for this or any songs that could help me with this? Thank you!!