How to hold myself physically accountable?

Hi, I've been diagnosed a few years now and have come a long way with system communication and other things relating to my DID symptoms and CPTSD.

The biggest thing I still struggle with is memory. After years of work and some integration, my memory is still very severe. I've been told because of multiple TBI's and other physical impairments from childhood abuse, my memory may take longer to improve.

How do I hold myself accountable when it comes to remembering to do things? I set alarms, notes, have people remind me, nothing helps enough. I was supposed to wash something of my friend's, he told me several times, and I just kept forgetting. I tell whoever is going to front to do but it gets lost somewhere. I feel horrible that my life is plagued by my lack of memory. I don't remember good things OR bad things. I feel like my memory only lasts a couple days at a time. I'm kind of at a loss here.