I don't think a Patreon will help you catch new readers, but it will help you to keep the best ones and get them hooked to your story, especially if you offer early access and other perks!I
I had a Patreon briefly around 2015-2016 but then I closed it because of school. I re-opened it last month and it's going slow but steady. I'd say open it and remind your readers regularly it's there, you never know how many people are willing to support you until you actually ask! A big number of subscribers doesn't mean you'll get a huge amount of Patreon supporters (although it helps, of course!), but I'd suggest you to also post on all your social media accounts because every follower counts 