Your vagina naturally cleans itself 24/7 so using soaps and perfuming products can irritate your china and therefore cause a strong odor. Also your diet can affect how your vagina smells. So eating healthy and avoiding soaps and perfumes in your vaginal area will help with odor problem.
As long as the baking soda routine worked for a few days, you could do that every three for four days, whatever it takes, to keep it under control. In time, hopefully, you won't need to do it as much or at all, at least until you get some better advice.