Well, if others say your voice is ok, then the next question is, what is bothering you - does it take you too much effort to do your voice, does it not work as well in other situations, are you getting misgendered because of the voice in real life or on the phone?
As others also said, if your issue is resonance or one of the other voice parameters, it may be that your voice does not improve much with surgery, because those issues will persist or even worsen. A few patients had voice surgery and say they have a voice afterwards that is worse than before. Apparently the reason may be that they had a good trained feminine voice before and afterwards their base pitch is higher, so it takes less effort to do that voice, but they still use the same voice basically, so to others it seems like no change, but they have some additional hoarseness which makes the voice sould less good than before.
For me, its a bit like that - people say my voice sounds the same to them, but I know that for me it sounds different and for me it is easier to just speak and not think before I speak and this makes me more outgoing and talkative now. But to the outside it seems to some that my voice changed little as I am now just comfortably speaking in what before was my relaxed-trained voice. The undertones changed a little bit, so there is some change in timbre, the pitch went up a little bit, but is all just subtle changes at times. And some of these are not really going to happen with a CTA alone by the way. AFAIK CTA does not change the timbre but mainly changes the pitch only. Basically it just simulates a permanent muscle contraction of one of the two pitch shaping muscles, so your voice exactly sounds like your voice now, just it sounds like you are raising pitch.
I hope you find a great solution, but I definitely would first get a really good picture of what your voice issues are - what your original and trained pitch are, what your resonance and inflection and all of these things do and if they are ok or need improvement and then make an informed decision about voice therapy or voice surgery.
Recently I have seen a lot of people flocking towards voice surgery because of some great outcomes, but they go there and expect it to be a magical cure - a voice feminization with the knife - just do the surgery and your voice will totally be feminine all the time. That is not what it does, sorry about that. It changes some part of your voice, thats all. I always call it a voice supporting surgery because it helps to give you a feminine voice, but you still have to do a lot yourself to get it
