How do I open another account? What should I change? Is it possible to open on the same computer?
It is not possible to open on the same computer. Google has to see this new account as if it was created and managed by a completely different person.
I'll explain what I do:
First of all, you get any popular anti detect browser; I use adspower, which gives 2 profiles, that is, 2 separated independent browser sessions, for free. You could also use anything similar, like dolphyn anti detect browser, octo browser, and [maybe] incogniton. These browsers emulate a real machine with different so called browser fingerprints and device parameters.
While creating a profile using any of these browsers, you need a private proxy for each session. For google, only residential or mobile socks 5 proxies would work, any other proxy types will suspend your account as google won't trust you. Don't go with cheap ones as they might be blacklisted by google.
Now, you either create a new google ads account or buy a ready one.
You said your ad was gray: if you have been suspended for either circumventing systems or unaccaptable business policies, you will have to use a different domain with [at least slightly] different content;
if you add the previous one, you'll get suspended in now time as that one is already flagged. You also need a new payment method as if you add the previous one, you'll get suspended again. Cannot help with this one, but many people here on forum sell VCCs: ask them if these work for google ads.
So whenever you use an anti detect browser, a good proxy, new domain with a different content and a new payment method, you're pretty much safe as these are main requirements to work with google.
There might be some more details, but those can vary depending on what and how you advertise.