I main kayo and I never flash because whenever i find a good time to flash, I tell them that im going to and they just walk in. How to counter this?

hello! heres my tracker https://tracker.gg/valorant/profile/riot/HyJinx%23100/overview obviously im not the best player, i usually just do viper since im most comfortable on her, i can do reyna sometimes when i feel like my aim is good but...