Lovely Boa!
Sounds like you are being very smart. Make sure you can/are properly caring for the animals you have before adding more. Don't add more unless you can properly care for them as well.
I wish more keepers thought like that!
You have to know your limitations, whatever those are. Mine are time, space, and energy. I had a kidney transplant and work full time (from home often though). I also want to be able to spend time with all my animals (which includes 5 dogs and 8 reptiles). I am at my limit knowing that any more would mean way less space for me and the fiancé and the dogs and I wouldn't be able to give all the animals the attention they deserve. Additionally, I think it would begin to feel like a chore at that point, and not a fun hobby.
Way to go for pacing yourself and being good to your Boa. If you want more snakes down the road, it will happen. Don't worry about it. Just learn as much as you can and do what's best for who you have. Then, when you are ready for another, you will get something you really want, and not just grab anything. Make sure not have any regrets!
I have 4 snakes and love all of them. 3/4 had a real purpose/meaning for me. The first was especially meaningful; something I had wanted most of my life. The final two, I knew were my final two, and I did a lot of research and got exactly what I wanted to complete my collection.
Good luck and keep us in the loop on Remby and any future animals!