I prefer non-retroactive, historical pronouns when talking about the past, for myself at least.
Pre transition me was a mess, he was constantly depressed, but current me is fine, she's able to smile in a way that looks genuine.
That's how I prefer it, but I don't think there is an accepted consensus on the topic. They/them works as its gender neutral, so could refer to anyone at any point, but I don't like it.
I hate when people use they/them as a hedge. I'll be out in public, and someone mau not entirely certain of my gender, so they go for what they think is the safe, respectful, and neutral option of they/them. And it feels like an insult. It feels like they're clocking me.
If I were not binary it would be good, but I'm not so don't.