In an earlier question, I answered a similar question, in that after a realistic amount of time, you still are not talking properly.
You have to discuss this with your practitioner, so he or she can resolve the cause of it.  It could be something very simple requiring a simple adjustment while you wait, or it may involve repositioning the front teeth requiring having the dentures remade.
Either way, it should be attended to and you should be able to speak properly in time.
Speech is affected by several situation, condition,s and the matter has to be diagnosed properly and the actual cause be address, instead of constant unrelated adjustments resulting in the dentures not fitting properly anymore.
Thank you for your question,