The ukulele forces you to be creative!
Well strumming some chords while singing a tune is in most cases not so finger breaking difficult. If you want to upgrade your playing skills then you will need another kind of know-how and a lot of practice that's for sure.
Do you want to be creative and write your own solo pieces? Are you ready to study harmony, counterpoint, musical history and musical forms! Good ears could help as well but it's not enough.
What about getting the most beautiful sound out of it?
When I listen to great ukulele players then I observe that they play:
for 3/4 punteado (plucked) style and only 1/4 strumming.
The most charming parts of ukulele music is in the sweet sounds of the ukulele punteado style. So for me the best ukulele music is not without the punteado style. Strumming can be very nice and attractive when it is nicely performed but not all the time unless you have a very nice song or it must be strummed by a beautiful charming girl.
A nice sound invites you to go on playing and will inspire you to make your compositions.
Beware for inefficient fingerings.
How to pluck "punteado" in the right way and how to choose the best left hand fingerings which are so important for a nice interpretation and to give that nice flow of effortlessly played notes? on the ukulele you will need a mixture of two types, violin fingerings and guitar fingerings. Not so easy, it seems as there are no rules but no rules kills virtuosity!
Plucking without nails (like on the lute) is nice when your fingertips are nice soft and dry I would prefer this but since I am also a classical guitarist this is out of question. Nails work also when you have the right shape and nicely finished and that's an art to keep them that way but it gives you other advantages as speed, tremolo and coulor changes metallico versus dolce...
There is a price to pay for every bit you want to advance!
I don't regret one minute that I bought an ukulele!
To day I own a Kiwaya concert KTC2 Kiwaya tenor KTT1 Honu concert Rope full maple Brüko soprano.
While the tenor gives the most freedom for compositions the soprano could produce the most soft tones. The choice is clear I will use the whole family, tenor as well a concert and soprano while I use the tenor always with a low G the concert and soprano will always have a high G string.
My goal is playing more solo concerts with my own compositions as well as arrangements of ancient music on tenor/concert/soprano ukuleles and spread the beauty around the world of this little marvel!