Foreigner (USA)planning a visit

I want to visit Germany for my 50th birthday (2032) with my wife during Oktoberfest. I have a few years to lock down what the travel plans are ( cities/regions/sites etc) and prepare for the trip. I’ve started trying to learn German. Any advice on what you would recommend to visit (Oktoberfest specific or general tourist) or prep for for a visit (10-14 days)? Danke.