I think I remember asking this question on here when DD was a similar age
We did change her bedtime to an earlier time, only because I wanted to be able to have dinner alone with DH. Dinner had become an up and down event where we'd do a bit of eating, and a bit of settling the cranky baby She went down well at around 7, though until she was about 7-8 months, she used to wake at 9:30 for the first feed (then often 2-hourly after that)... So, my sleep routine advice isn't necessarily valuable, LOL!
One of my friends has an almost 6mo who stays up til around 9pm, then sleeps through til around 6am. That is certainly working well for them as a family, so they won't be changing it any time soon