I remember feeling really limited on GNU/Linux; for me, it was the desktop environment. Switching to KDE Plasma gave me back the kind of power and usability I was used to from the GUI.

Besides that, always be sure you're following tutorials for your specific distro, and a recent version at that. In my early days, I borked my system many times by pasting commands I didn't understand meant for other distros or older versions of the distro I was running.

On software, I would recommend trying to find FLOSS replacements wherever possible. People often sell Linux as being able to run most windows software, and while that's true, you'll almost always have a better experience after taking the time to learn a FLOSS tool written for the platform. Even with proprietary native applications, companies often consider GNU/Linux an afterthought and the experience suffers. If you're using KDE Plasma, for example, try finding a KDE app at apps.kde.org.

For a distro billed as beginner friendly, I always had issues with Ubuntu too. The most trouble free distros I've ever used were Manjaro (which I still use to this day on machines I want to just work out of the box - ignore the hate), and Mint. Manjaro comes with an official KDE Plasma verson too.