Hi OP. This is what we did. I appreciate you might think I am a bit harsh but it worked so incredibly well. I wish I listened to my in laws and did it sooner...
I EBF until 6 months. I started giving DS one bottle before bedtime (7pm). I did this as I knew he had a good amount of milk with the hope he would sleep longer. He continued to BF 2-3 times through the night. So I decided to bring in an additional bottle at the 1am feed.
Since introducing the 2 night bottles that's all he had. He began only waking once per night.
He hit 8 months and began waking up 3-5 times a night again 
. But because I knew he had a good 7 Oz at 1am I knew he wasn't hungry.
If he woke up a second time I would give him 3oz milk diluted into 7oz water. I further diluted it each time until it was just water I offered him. Then I cut out the 1am bottle and only offered water full stop.
By this point my breastmilk supply had disappeared due to not night feeding 
so be really careful- I'm not sure what to suggest. But for us stopping Breastfeeding was a good point and it felt a natural end.
The bottled milk definitely helped a huge amount. But he still wasn't sleeping through.
The contraversial bit:
When he was 10 months, i began working again and physically couldn't handle getting up in the night 4+ times. So one night i left him to cry it out. It was incredibly difficult, my DH supported me. At 2am I lay listening to his little cry it was heartbreaking. After 30 mins he had settled and fallen asleep again.
At 4am I heard a whimper, but no crying and he fell back asleep until 7.
He has slept through ever since (apart from when he was ill. In which case I was of course more than happy to give him water, a little milk and a cuddle to help him sleep).
I wish you luck. But being a little tough helped us so much. My boy is 1 now and a very secure, independent and loving baby. Hopefully this continues :-)