You should not enter a marriage thinking I will make him romantic when he is not, I will make him exercise and lose weight when he/she is overweight, I will make him deeni and he will start praying 5 times a day and we will wake each other for #tahajjud when all he does is hardly pray the Friday Salah. You should step into marriage with a person whose present you are satisfied with and not of some illusion you have concocted in your head will happen as a consequence of marrying you.
This ofcourse doesn’t mean a person cannot change after marriage but we cannot risk something as big and important as marrying someone whose deen or character we are not satisfied with based on some future dreams and scenarios that are solely ours.