Jakabella,
We went to a sleep school in Kooweerup just for a day visit. It was fairly gentle and more about teaching settling techniques than anything else. My dd has silent reflux and because she was held constantly as a newborn, even when she was sleeping because if we laid her down she would wake screaming in pain she struggled to fall asleep on her own in a cot. So we went to sleep school and they first took bubs into a dark room with soft music and did some settling. She went off to sleep with their techniques but only slept for 1/2hr and they had a raised cot so her reflux didn't worry her. We were basically taught however we settle her in our arms do the same in the cot, rock, pat, shhh etc and then gradually decrease it. I was happy with what they taught us but it didn't help her sleep. she could go to sleep but wouldn't stay asleep and wouldn't resettle once she had woken. She sleeps only one sleep cycle during the day even still now. It has pretty much just taken months of patience, consistency and gentle parenting to get her to the point she is at now. She is 7months old and will now put herself to sleep, if she wakes in the night she will usually put herself back to sleep if she's not hungry but she won't sleep longer than 1 sleep cycle during the day. I did the gradual process of slowly decreasing the patting, then would just sit with her with my hand on her chest gently rocking her in the cot. Now I put her in and she goes to sleep. I'm proud that we have never done cry it out, never has bedtime been a distressing time for her except for when she couldn't sleep because of the reflux.
Sorry that was of no help whatsoever because you want bub to sleep more during the day, I don't have any answers for that. And my daughter went through a period around 4 months where she woke hrly through the night, this lasted 6 weeks. Once we started solids she was alot better. She now sleeps through. All i can say is hang in there it will get better and no matter what don't let anyone convince you that you need to do something you're not comfortable doing, health professionals don't know your bub like you do.
Sorry I couldn't help but it will get better