Someone in here mentioned bitwig.
I started on abelton and moved to bitwig around 3.X and have been with it ever since.
I love all the different modules and the grid which has give me a lot more expressive control over my sounds.
they are similar yet different; I believe the core bitwig team were ex ableton devs who wanted to take things in a different direction.
I know it's silly but one of the biggest things that I like about bitwig is customizable shortcuts; this is especially good if you're coming from ableton because if your a shortcut key wizard you can easily remap similar functions.
if you've got an extensive VST collection you can run them with wine + yabridge.
Bitwig is not the only option, but coming from ableton if you want to run single boot it is the most similar (IMO) to Ableton.
Happy to answer any questions you may have about it as well.
Not too long ago I broke down a the costs between Ableton and bitwig, and they are quite similar over time.
Ableton has the big #'rd updates where as bitwig you get all updates within a year from license activation.
Since BW will still run after the license runs out (you just cant update to any new versions) I don't always update until there is a new feature that I want to work with drops in an update.
I also limit purchasing licenses to sale periods as a license can sit on the shelf until you're ready to activate it - this significantly reduced the cost for me.
I think there are other ways to go about this though on the vast sea of the net if your sails catch the wind right ;). If you're making stuff for fun and not for profit I think everyone should have access to creative tools.
If you make money than it's worth considering sending some. money their way. ¯_(ツ)_/¯