I think this is actually something a Social Media Manager with a strong content strategy background could help you with.
From what you described, you already have a clear goal: building your personal/professional presence and establishing yourself as someone worth following in your field. The issue seems to be less about knowing why you want to post and more about having a system that makes posting easier and prevents you from overthinking every piece of content.
Since you specifically want help with content ideas, planning, editing, and scheduling, I’d lean toward a Social Media Manager who also understands content strategy rather than hiring a strategist alone. A strategist can help you figure out the direction, but an SMM can help turn that strategy into actual content and keep things moving consistently.
A good SMM could also take some of the decision-making pressure off you. Instead of constantly asking yourself what to post, whether something is good enough, or whether people will like it, you’d have an agreed-upon content plan and someone helping you execute it. Many SMMs work with 30, 60, or 90-day content plans, although the exact process depends on the person.
For the “I still want it to sound like me” part, I’d make that very clear when hiring someone. A good SMM shouldn't completely replace your voice with generic social media language. They should learn your tone, opinions, personality, and the way you naturally communicate, then use those as the foundation for the content.
For budget, $500–$1,000+ per month can be a reasonable range for freelance social media management, but it depends heavily on the scope. Someone only creating a content plan will obviously cost less than someone handling strategy, content creation, editing, scheduling, community management, analytics, and reporting.
As for where to find someone, you could look at LinkedIn, Reddit, Upwork, Fiverr, or referrals. I’d focus less on finding the cheapest option and more on finding someone whose portfolio shows that they can actually develop a content strategy and adapt to a person's voice. Since this is a personal/professional brand, I'd also look for someone who has experience with personal brands.
And honestly, I don't think hiring an SMM for this is overkill. If the main thing stopping you from building your presence is overthinking and lack of structure, having someone create that structure and keep you accountable could be exactly what you're looking for.