Dee
You can take your appeal further but not because you disagree with the Decision, only because you can show that there was an Error of Law in the making of the Decision. See
What is an Error of Law? The first stage of this process is for you to request a Statement of Reasons from the Judge in charge of your hearing
Tribunals – Requesting a Statement of Reasons Or, you can report a Change of Circumstances by writing to the DWP office dealing with your claim but I would first understand where you can score the extra points that you need for a higher award, whilst you might disagree with the views of the Tribunal panel you need to consider why they did award you higher and how you might now show that you should.
If you do send a letter then I recommend that you use a Tracked post so that you have proof of delivery.
Understand that reporting a change will result in a new Decision on your claim which will supersede your current award, whatever it is.
Gordon