I’m so sorry to hear about the fire! I know losing everything is incredibly difficult, so I hope you’re okay.
If you have a renters insurance policy, you could submit a claim for everything you lost up to your policy’s limits. If you don’t have a policy, you wouldn’t have coverage.
That said, it is your landlord’s responsibility to maintain the building. If the fire occurred due to negligence on their part or lack of maintenance, you may be able to take legal action against them. If you’re interested in pursuing this option, reach out to a lawyer specializing in insurance claims. Most offer free consultations giving you a better idea of your options.
I wish you the best of luck!