Uke Nut is an interesting blog, covering various ukulele resources, including links to a selection of fingerstyle tunes & practice drills. Amongst the instructional postings are some links to a useful site of tools – MusicTheory.net.
Uke Nut has customised the Fretboard Memorisation Tool for a standard gCEA-tuned uke. Use it to practice identifying the notes up to the 10th fret. This will help you develop your skills, including helping you form moveable chords more readily.