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In honesty I think you need to find the commitment inside yourself first. Just hiring a coach wont work. You could just get your partner or friend to monitor you. Find a goal to aim for and set milestone mid term goals also.
That said, I do understand. I dont really have any recommendations. I used to have Ric Stern coach me, but while it worked, i didnt like the style of riding. These days i coach myself and i have Jon Barker do what you're looking for, he is my oversight, and sounding board. I need the opposite though, someone telling me to ride less. https://www.palmares.co.uk/about
Unless you're paying 150 quid a month you'll likely have a cookie cut plan that's no better than something you can find online. Just dont go to one of the big coaching business, as there you are just a number.
You wont get nutrition too unless you spend more money. Buy a good nutrition book. Louise burke - clinical sports nutrition.
You could.look though here: https://www.trainingpeaks.com/training-plans/cycling/road-cycling
If you dont do much now, anything will raise the bar.
What's your budget?
You also need to find someone you align with. And I'd recommend thay have actually qualifications and perhaps even a Dr. before their name.