How do you keep going? I've been trying to improve myself

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How do you keep going?

I've been trying to improve myself for about two weeks now. I've been going hard at uni and self studying. Been trying to catch up on the shit I ignored back in high school and trying to pick up some valuable skills.

I started out strong right out of the gates. I have a checklist of things I have to do every day and complete them pretty quick and retain what I learned. Now though, it's just a slog getting through them. I still accomplish what I have on my checklist, but it feels like I'm just going through the motions now instead of actively improving. My knowledge retention is at an all time low and I feel like I have to go through previous chapters multiple times over just to comprehend something.

I thought it'd be easy once I got started trying to improve myself. I thought I just needed to start moving and inertia would take over, but it's just getting more and more difficult to focus.

I feel like I do when I'm running. I can sprint short distances, but am hopeless at jogging long distance. How do I keep myself going? How do I stop myself from falling back into old, shitty habits? I just want to retain the drive I had when I started this.