Protect leaseholders in buildings under 11metres against remediation costs

The Building Safety Act, passed by Parliament, only protects Leaseholders in buildings over 11metres in height. The Government's position is that there is no systemic fire safety issue in blocks below 11m. My building is considered 'at risk'. Without the costly remedial work (or other government guidance) I cannot re-mortgage, banks won't lend & sellers won't buy. I am trapped in my flat that I cannot move on from, in a building with unsafe, high fire-risk defects that I cannot afford to fix.