If you have gained some Linux skills after using Ubuntu for some time, you may try switching to these distributions to explore the world of Linux distributions further.
Ubuntu is one of the best Linux distributions for beginners. It's an excellent platform for people new to Linux. It is easy to install, has tons of free resources available along with a massive list of applications available for it. https://itsfoss.com/distribution-after-ubuntu/
(Score: 1, Informative) by Anonymous Coward on Saturday March 24 2018, @08:58AM
This is the obvious choice. It's quite similar but gives you a more leeway and perspective.
I think Ubuntu has good marketing but it's not much of a distro, really. It's still not easy or polished enough. Also the Ubuntu forums are a sorry sight where blind lead blind. Their advice should be taken with a mountain of salt. Never run commands you don't understand.
I've been running GNU/Linux exclusively since 2006 or so and my only regret is not doing so earlier.