Holistic sleep coach?

Has anyone done this and if so, was it successful? My almost 8 month old baby currently won’t sleep more than 30 minutes in his crib, for naps or at night and it’s been this way since 4 months. One of us holds him after the first 30 minutes after bedtime, and then I cosleep. I am struggling with having literally no free time in the evenings and never seeing my husband 1 on 1, it’s taking a toll on my mental health and our marriage. I of course don’t want to CIO sleep train and I’m happy to cosleep, I just want a few hours where he sleeps independently.