Changing habits can be really challenging, but if you want to change anything in your life it is really important - and most of the time also really rewarding.
Connecting habits has proven successful to me. So if I want to start something new, e.g. do 20 push-ups a day, I am just adding it to an already exisiting routine. A voilà, it makes it a lot easier to start with it.
But it can be hard to break a habit, if you don't exchange it for another one, especially if it is something pleasing.

Cheers,
@andy-plays