Career dilemma- Product Management

I am currently managing a product, which has not really scaled up as expected over the last 1.5 years.

Hand to heart, I can say I have given my best in terms of efforts but still the outcomes are not as expected due to many factors beyond my control.

Now this has created a perception amongst senior management that my team is working very slowly and not able to build what customers want.

It is very difficult to change this perception in short term

I have asked for change of product portfolio multiple times but that is not getting entertained.

Any suggestions if I want to stay in this company (other than the very obvious - looking for opportunities outside the organisation.)