If you’re not a developer, then it sounds like you’ll want to go the paid route. There are a lot of people offering migration services – you can even talk to a HubSpot rep and they can recommend the best course of action for your situation.
We consistently see faster websites (even on WordPress sites coded “correctly” and free of plugin bloat) and an editing experience that content creators actually enjoy using. I’ve never had any content editor wish to go back to WordPress – not one single one.