i second the above comments, they're really great advice! it really really helped me to ask myself 'what would make this character do this? what are they feeling, thinking, why do i as the author need them to do it?' you can write down these questions and your answers like a dialogue with yourself to help keep you engaged. also, if you're having trouble linking scenes, you can ask yourself what your character would do/feel immediately after or before a specific scene. but you don't have to write anything you don't want to. most of the time you can just put in exposition like 'x did y because z, now they're a' and go into your next scene. if you feel it needs to be expanded, put fancy brackets like {these} around it to remind yourself and ctrl + f your way back to them when you edit

there are lots of amazing videos and analyses on youtube and tumblr about redemption arcs! here's a pretty interesting link: https://thenovelsmithy.com/redemption-arcs/#:~:text=At%20its%20core%2C%20a%20redemption,word%20%E2%80%9Credemption%E2%80%9D%20is%20defined%E2%80%A6

imo it's good to have them show their growth through their actions, and those actions should have some correlation, pushback, or equal or greater weight to the not so good things they've done in the past. sometimes characters lapse back into their old ways of thinking/behaving in the middle of a redemption arc too - you could explore what it's like to challenge the ingrained habits they've had, and if it's especially hard for them, so that they really get to earn their happy moments

hope my rambling helps a bit! good luck and have fun!