I'm 43 and 14 weeks!
I have a lot of similarities with you, have a 5 year old born during lockdown - he was 5 weeks early and the birth + hospital stay afterwards were quite traumatic.
I would say if you feel like you'd like to extend your family then just go for it. Plenty of women having babies in their early and mid 40s naturally. I can't say I'm not full of anxiety, time feeling like it's against me adds an extra layer of that, but it's certainly possible so trying to think positively (I had an early loss last year before this pregnancy MMC at 12 weeks), but with each scan I feel so much less anxious and I think after the gender scan in 2 weeks I'll allow myself to get really excited. The phrase "different baby, different pregnancy" has been so helpful.
Scans I've had are 6 weeks (NHS EPU), 10 week (private), 12 week (NHS).
I also have 2 friends older than me that had their second babies naturally and without any birth trauma.
Only things I did, which may or may not have helped, were drinking plenty of water, cutting down on sugar (still love a sugary tea!), making sure I move around a lot - not so much formal exercise but just as part of my job - and taking a slightly higher Vit D tablet. I also found I was ovulating earlier and it was happening pretty much exactly when I was getting a positive on ovulation strips, so starting trying earlier after my period (every other day from day 8 onwards until day of peak reading, then two days in a row). Not sure if any of this is relevant or coincidence, but leaving it here anyway.
Good luck on your ttc journey if you choose to go for it, mainly I want to tell you that if you want to then you should just go for it!