Your old node might be DQed, but since you have created a new identity that shouldn’t be an issue. DQ is done via node ID, so it’s not your public IP or your computer that is DQed - only your identity.
You can create multiple identities with the same email adresse, so that won’t be the problem either.
According to this thread your “failed to dial storage node” error seems to be caused by a DDNS issue (aka port is not open!). Please double check your port status.
Thread: My new installed Storj Node ist offline (german) - #3 by LinuxNet