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I wouldn't deny the possibility that OP is might be targeted by someone who knows hos email address, and also knows that he was a Coinomi user. It is highly expected if the person is using only one email for all his activities online. It is a commun mistake that all newbie do it at the beginning of their crypto journey.
Now anyone's identity can be hacked easily and hackers get data from government websites that are hacked or websites that do KYC for everyone and that data is then traded.
There are many cases of data hacking and not just emails, full names, home addresses, phone numbers are all owned by hackers today.
So if only the email known by the hacker is very easy and not just 1 target they are targeting,
usually they broadcast on emails that seem to be still active and whoever opens or responds to him will continue to be the target victim.
Don't use the primary email as an email to surf the internet or an email used to follow Airdrops and such.
I always use my backup email (not the main email) for various random things on the internet, so it's not too risky.