We were in a similar situation. After 1 failed IVF, I was ready to get off the crazy train and move to adoption. We did so, and I was so happy, bc I knew I was getting SOMETHING (SOMEONE) at the end of the process.
THEN, after adopting #1, we have now gone back to do two FETs to use up our frozen embryos and give them "a chance." We did two FETs ( we had 3 frozen): the first, we put two in, it was negative. The 2nd, it ended up being cancelled at the last minute b/c the last remaining embryo did not survive the thaw.

Poor little embryo.
So, our situation is BIT different from yours in that I understand you do already have one child, but I personally felt I "owed it" to my embryos to give them a chance: I had created them, I had to give them a chance at least. I perfsonally felt I would be being selfish (I felt this way for me) to just go for what I wanted (parenthood) at the expense of them, who had been created by me in the first place.
So, best of luck to you. I am just sharing my thoughts and I feel a big sense of peace now that I now we tried them, and can now move on. It was a challenge; I did not want to get back into this craziness all over again; but I do feel a bit sense of peace now that I know I tried, and now can move on with a nice sense of closure.
Good luck to you.