Hello
Try adding dairy products like curd, paneer, cheese etc
And if you are non vegetarian try adding eggs , fish, chicken , meat (
liver is great source)
Also as you have taken injectables that means your doctor is of the opinion that you were deficient due to poor absorption of it.
Next Steps
I would suggest to take another follow up test to check after stopping injectables are you still maintaining the level.
Health Tips
For further details you can consult me on practo!
Best wishes