St Augustine grass is in dormancy right now, so it’s not growing or doing anything. Don’t rip it out, come spring, it’ll take off. Call a few lawn care companies (we use Florida Pest). Have them give you recommendations on treatments and price quotes.
Also check your irrigation system to confirm it’s running right. St Augustine grass usually crowds out most weeds when it’s thick and healthy. So figure out why it went downhill in the first place.
I’d gather that a good spraying for weeds now, and a good program next year including fertilizer, weed and insect control is all you need. It will take time to recover but it will get there.
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