Plesk is still great, the other alternative is DirectAdmin but the issue is that control panel is so dated, never was popular till now! if you required to change the settings with DA you need to use more SSH instead of control panel, in my opinion if I do use more SSH (I don't have any issues to use SSH) but what the point to pay for GUI?
DA is the best option right now. Not only it has better gui than others but because of its enterprise level support. You can also go to cyberpanel and Hysteria panel both have good user interface but in the end DA is premium in comparison to them (ofcourse not as premium as cpanel). I am also experimenting with DA. It is taking time but lets face it we have to do something if we want to get rid of cpanel black mailing.
A lot of users are switching to DirectAdmin and CWP panel after the sudden price increase in cPanel. A choice can be put on the customers they can stay on the servers they are on and have a price increase for using cPanel, Or they can move to one of the alternates.