The desire is the most important thing. It’s wonderful that you want to become more religious. But you must take some action so it doesn’t dissolve. Mashiach Agent is right about one step at a time, although one Mitzva a week/day sounds like it could be too much.
When you add on one thing even if it’s very small, it leads to more automatically. The best is to pick something that is not too hard as MA said but at the same time something that will inspire you. It should be something that will make you feel good about your connection to Hashem so that it will lead to more growth. Maybe try to have kavana for one particular phrase in davening that speaks to you. Or add a tefilla that you don’t already say.
It’s also a good idea to ask Hashem for help. I heard a beautiful story about that, but I’m too tired to post it now. I will try to do it tomorrow bli neder.