What a lot of ageist rubbish is being spouted on here by some people, OP. And also rubbish from people who have not been through IVF and don't understand the preciousness and potential of a frozen embryo to many of us who have been through it.
I have been in a similar position to you - first IVF baby born when I was three months short of 43 after 10 years ttc and on our third IVF cycle, severe pre-eclampsia and baby delivered by c-section early but thankfully fine, We had three frozen embryos left and I agonised for three years about what to do with them because of the experience of the first pregnancy and the fear that the same thing might happen again.
I knew there were risks to me, the baby if the transfer worked, and also for DD and DH, but I also knew that I could not leave the frozen embryos to perish or donate them for research. I'm pretty sure my age ruled out embryo donation too.
I went ahead with the transfer the day before my 46th birthday and DS was born healthy and at term when I was three months short of 47, with no pregnancy complications. Part of me had hoped when I had the transfer that it would be unsuccessful but I also felt that I had to make the decision that was right for me and then deal with whatever happened.
I consider myself very lucky that things worked out OK, and all I can advise is that you get good advice from your doctor on the risks and then make your own decision. That's what I did.
In terms of having another baby at (almost) 47, well, my children are 12 and 8 now and no-one has ever ridiculed me or them about my age. Only twice in twelve years have I been mistaken for their grandmother and you know what? I don't care! My children are happy and well cared for, and I do loads of stuff with them. I have no idea if I look my age but I can tell you that, because of my children, I am younger in my levels of activity than people I know who are younger than me.
Obviously I'm aware that I am an older parent and I wish I had been able to have them earlier but that is not the way it worked out. You have to take the cards life deals you and make the best decisions for you and your family that you can. For me, the frozen embryos were part of my family and I could not have dealt with the guilt of not giving them a chance. I accept that other people might feel differently but my feelings about my embryos were also valid. And when I look at my beautiful DS, I am so glad that I chose to give his embryo a chance.
Apart from getting advice from your doctor, I also think you also need to work through the various scenarios about what would happen if things went wrong for either you or the baby in some way, and see if you are willing to take the risks, especially given that you have three children already. You need to talk it through with your DH too but ultimately I think the choice has to be yours.
The suggestions about getting counselling and re-considering donation might help but, in the end, it will be down to how you feel about things.
I get where you are coming from entirely, and I hope you can reach a decision that you are comfortable with.