Interesting. I just did this whole analysis and deployed a model in 2 minutes, starting from the Kaggle page and dataset. For the parameters visible in your deployed model my model predicted Converted likely 53.41% of the time. The model has 95.29% accuracy which is considerably better than yours. This using Hazlo.ai.

I have no interest in Hazlo except as a user.

Here is the deployed model: hazlo.ai/e/uNtX9oDJ

What do you think of this system?