Sleep Training

He’s 10 months old and his sleep really hasn’t improved since he was 4 months old. I thought he would get better over time but it’s so slow that it’s almost stagnant. I’ve considered doing sleep training but it seems like my partner disagrees. I don’t know if I could do it either but I feel like we should try. At this point my quality of life is diminishing. Something’s got to give. Why aren’t things getting better ? Why won’t he sleep? He’s not colicky really anymore. I have no idea what’s going on. It makes no sense.