The ONLY issue with remaining on sequential over the long term is a VERY SMALL increased risk of endometrial hyperplasia, which if left can progress to endometrial cancer.
Sequential has however been shown to have lower rates of breast cancer than continuous, so the argument is not one sided, and of course your quality of life is important too.
If you are willing to have regular scans to monitor your endometrial lining, which you may have to pay for as the NHS doesn't offer this, there's no reason you couldn't go back to sequential.
The NHS may not agree with this though, however once a prescription is dispensed it is within your control if, how or when you take it. You would have enough on your prescription that you could do this without having to get into any arguments.
This doesn't mean you wouldn't also benefit from testosterone, you can always try this as well.