The thing about imaan is, you have to work for it. It’s one thing to make du'a for Allah to increase your Imaan, and it’s another to put the effort in.
It’s like working out. If you’re going to wish to get fit and healthy but sit there and eat cake, you’re just going to get fat. But when you go to the gym, work out and eat healthy, you’re going to see results. It may take long, but in the long run, it’s worth it.
And Imaan is just like that. Make du'a but work to increase your Imaan and Allah will open your heart to love Him and be obedient towards Him. For He has mentioned in the Qur'an:
“No amount of guilt can change the past and no amount of worrying can change the future. Go easy on yourself for the outcome of all affairs is determined by Allah’s Decree. If something is meant to go elsewhere, it will never come on your way, but if it is yours by destiny, from you it cannot flee.” (Umar ibn al-Khattab r.a)