Bed time for 4 month old?

[Shabeth]

I know how some people can get over little babies and structuring sleep but I'm exhausted and confused so go easy!
I'm a ftm to a 4 month old and since she's gone through her latest growth spurt her whole sleep routine (something she got herself into) has changed and I'm so confused with bed time!
Between 6 and 14 ish weeks she was a really good sleeper usually falls asleep a couple hours after she wakes up then puts herself down in the afternoon for a couple hours catnapping in between we just let her do what she wants. At night she would fuss and cry from about 7 to 10 with no chance of sleep so we would do bath and bed at 10 and sleep till 8 am with one feed at 4.

Since around 13 weeks she's become so much more alert and we've started having to put her down for a nap in the afternoon instead of letting her go herself or she's so interested in everything she won't sleep and she gets really fussy.

The issue is night time she obviously can't go until 10 anymore and she's started to wake several times a night. So we've been doing bath and bed around 8pm when she's mostly still pretty awake anď it works. But some evenings like tonight she's just crying and rubbing her eyes at half 6/7, I'd just let her nap and put her to bed when she wakes up but she won't nap. Do i stick to a time or just put her to bed when she's sleepy? How early is too early? I know it sounds like a stupid obvious question but it's so confusing I'm worried she'll end up napping instead of going to bed for the night and won't sleep.
She's up every two hours as it is 😴

At 4 months both DDs would be bath and bed around 6/6.30. DD2 who is now 1 certainly couldn’t get past 6.45 until around 10 months... I totally think sleep breeds sleep!

Since about 3 months, our day looks like this
Wake up 8/9am
Morning nap 11ish
Afternoon nap 3ish
Bedtime 7ish

The better naps she has during the day the better she sleeps at night. She's been sleeping through 7pm-8am since 3 months

If she is looking really tired i just put my LO to bed

It sounds like it might be time to try an earlier bed time. We haven't been keeping her up to sleep longer she's just gone thay way putting her to bed before 10 was impossible she would sleep all day and be wide awake from. 7 to 10 but she was sleeping almost a full night so it worked.
Now she's stopped sleeping during the day unless we feed to sleep and try for a nap and she wakes every two hours at night I don't know what's happened :(
People keep telling me that at this age we should just let her sleep when she sleeps but she's a tricky one if we put her to bed before she's ready it won't work and she'll just cry. But then we end up leaving it too late and she gets overtired and won't settle.

When she falls asleep for her longest stretch. DS2 was 10pm.

I've got a 4 month old. He's up at 7, nap 9.30-10.15/10.30, 2 hr nap at some point between 1 and 4. If it's on the early side of that (say 1-3) he might also nap 5.30-6ish. Bed is 7.30-8.30 depending on whether he's had the extra nap. I don't really put him down at set times, just see when he gets tired. Not planning on trying to establish a more fixed routine until we introduce solids. He's ebf and still feed at least twice at night.