Practice, Practice, Practice
Explore, Explore, Explore
As far as practice is concerned, do as much as you can. Realize that there are many things and activities competing for you time and attention – work, family, school, money, etc, etc. You WILL progress if you stick with it. Only your rate of progress is variable and of course, related to time and effort you put into it. No matter the time available.
Unlike the traditional schools system with grades, tests, pressure to progress at a pre-established pace and competition. Private one-on-one study, self-study has none of that, this is pure learning. You learn because you want to learn. There are available tools, guidance and organizations to make that happen for you.
All learning is cumulative, especially learning a musical instrument like the ukulele. Don't worry about the weeks with low or no practice. You always continue to get benefit from any previous practice sessions. Your goal is to improve – day by day – week by week. That won't stop you from achieving your goals.
Simply play as much as you can, interacting with other musicians. At the very least, work with prerecorded tracks, CDs and/or YouTube. Those tracks could be Professionally Produced or they could be just you recording and playing over chord changes.
Enjoy the process of developing your skills. Don’t be overly focused on some objective standard about your proficiency. There is no objective standard!