Crashing the Kubernetes cluster

hello
One of our colleagues started to destroy the Kubernetes cluster when he was fired.
So now when I run every command from Kubernetes, I can’t see anything.
I hit the command kubectl cluster-info dump I get a same error The connection to the server 127.0.0.1:6443 was refused - did you specify the right host or port?.
I hit the command kubectl get po -v=10 I get a bunch of errors
Please help me. Thank you

I1013 11:53:33.096288 6149 round_trippers.go:553] GET https://127.0.0.1:6443/api?timeout=32s in 0 milliseconds
I1013 11:53:33.096590 6149 round_trippers.go:570] HTTP Statistics: DNSLookup 0 ms Dial 0 ms TLSHandshake 0 ms Duration 0 ms
I1013 11:53:33.096669 6149 round_trippers.go:577] Response Headers:
E1013 11:53:33.097124 6149 memcache.go:265] couldn’t get current server API group list: Get “https://127.0.0.1:6443/api?timeout=32s”: dial tcp 127.0.0.1:6443: connect: connection refused
I1013 11:53:33.097221 6149 cached_discovery.go:120] skipped caching discovery info due to Get “https://127.0.0.1:6443/api?timeout=32s”: dial tcp 127.0.0.1:6443: connect: connection refused
I1013 11:53:33.097570 6149 helpers.go:264] Connection error: Get https://127.0.0.1:6443/api?timeout=32s: dial tcp 127.0.0.1:6443: connect: connection refused
The connection to the server 127.0.0.1:6443 was refused - did you specify the right host or port?