Hello @svet0slav,
for security and scope limiting purposes, you should not change the default LimitNOFILE system wide rather than applying it to the systemd service that runs your storagenode and suffers from insufficient resources.
You can add this line gateway-st/gateway.service at 6acd5fd2fdd6ffeaeb145b13f388226dad9af44c · storj/gateway-st · GitHub
and potentially even dial down. (default is 1k, this setting bumps it by a factor of 64x!)