The work becomes part of you when you stop treating consistency like punishment.

As long as a practice is experienced as a sentence you are serving, part of you will look for parole. The mind resists anything framed as punishment, and no amount of willpower fully overcomes a frame you keep reinforcing. Something shifts when the work becomes a way you look after yourself rather than a penalty for not being better already. It stops needing to be enforced.

Notice the language you use about your routines, especially whether you talk about them as things you have to get through. Try describing one as something you are giving yourself rather than paying off. It sounds like a small change and it alters how long you last.