11h night sleep is average nights sleep for this age. But anything in the range of 10h-12h would be considered 'normal'.
Therefore being asleep by 6.45pm will give an awake time of 4.45am onwards and this would be considered absolutely normal for the bedtime. You can't have both ways - you don't get baby in bed super early and also a nice, reasonable morning time, you'll also get a super early morning.
I was doing 8pm bedtimes bedtime at that age, to give an average 7am wake up. Baby needs a later bedtime. But it is not just about just putting baby to bed later and crossing your fingers. That will make matters worse, you have to look at the bigger picture and what sleep is like over the whole 24 hours.
This is not something that will be sorted in a few days, you may have a month of upset as the routine is disrupted, until the new one establishes.
I'd suggest that awake time in the morning is too long and then with a short morning nap, baby is starting the day over tired. It then progresses through the day and so by dinner time is exhausted and ready for bed.
Do you wake baby from that morning nap, or is baby naturally waking after 30 minutes?
If baby is naturally waking after only 30 mins, I'd suggest that between your 5.30am wake and an afternoon nap, you could fit two short naps in. Say 5.30am wake, 7.30am nap, 10am nap (2h awake times) then have a longer awake time to give the afternoon nap start time of 1.30-2pm. This gives you wake up time of 3-4pm and so bedtime can shift to 7-8pm.
This isn't the long term plan, it's an interim to help baby move bedtime without being exhausted. You need to find ways to allow for extra daytime sleep because until the adjustment is made in body clock rhythms, baby may well have nights going to bed at 8pm and still waking at 5.30pm. It takes time to see a change in bodily sleep rhythms.
So have a 'make do' period of time where you allow for baby getting more daytime sleep because nights are shorter. If baby can't do this by having longer naps, you need to adjust awake times to allow for more naps.
Once you have found a daytime routine that means baby is getting enough sleep to manage a later bedtime, stick with it for several weeks. Once the later bedtime is established, then make the morning nap later.