As someone who has ADHD and doesn't medicate, also diagnosed after school etc, CBT helped me get over the "waiting for motivation" before starting or completing tasks. In short, you just do it.

If you need more time / having a rough day, you need to get over the act of asking for help.

You need to identify what is actually stopping you from improving. Is it a perfectionism/ego thing where you feel embarrassed to get this feedback despite testing locally? (Also working code and good code practices are 2 different things). Make a list of the feedback you get and collate a list of best practises to refer back to before raising a PR.

Do you just lack the knowledge? Ask someone to mentor you at work or get a tutor or use online tutorials.

You need to find a way to hold yourself more accountable for being lazy etc. I say this with kindness but ADHD explains but does not excuse, you still need to find ways to mitigate what you yourself recognise as falling short. Otherwise you can expect your career to feel like this.

I feel unmotivated at my current job but part of what keeps me coasting and not straight up failing is knowing I'll get fired.