Can you point me in the right direction in regard to cyber security?

First of all, forgive me if this isn't the place for this post. I've read the sub rules and don't think I'm violating any? If I am, or this post is inappropriate, of course remove it -- though I would appreciate a nudge in the correct direction to ask this question.

I'm not sure what to call what I'm looking for. My wife and I need to find someone who can look at an ongoing security situation and advise how to go forward. Obviously we expect to pay for this service. I just can't find a company that seems to be offering it short of those directed towards politicians and celebrities. As we're neither, nor rich to boot, those don't seem right. I am hoping the knowledgeable folks here might be able to point us in the right direction.

I have an issue where someone has access to my wife's Youtube account and (we assume it's the same person) has been trying to get into her gmail and other associated accounts. We've done everything Youtube and Google recommends and have had two-factor authentication active from the start, to no avail. We also have Google Authenticatior active now. We're looking for an expert or company who can answer our question as to how do we remove this person from my wife's account and what should we do to lock her other accounts up extra tight?

If it helps, we're certain someone is using her Youtube account as videos frequently appear in her watch history that she hasn't watched. Other times, her watch history will be turned off. She'll turn it back on, then it goes off again. Repeat ad infinitum. I've researched this issue for several hours and can find several threads of others having this issue, but no one seems to have any answers. The issue got worse when we started receiving emails from Google about too may log in attempts when we hadn't attempted to log into my wife's accounts. We believe this is related to the Youtube issue as she uses her Google account for Youtube.

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If y'all could point us in the right direction we'd greatly appreciate it. Who should we contact to help us solve this issue?