I wonder if I'll be ever able to re-learn how my fingers used to work and reach the level I was at then but I'm doing my best. Even some improvement would be good. I just enjoy it and I wish I had never stopped playing for such a long time.
Definitely feeling your pain here, as I was in the same situation! It does and will get better, promise. I've been back playing ca 6 years and have recovered a lot of my original technique and better. It did take work, but it was only frustrating because of what I once *could* do. On the good side, even though your fingers don't want to move fast, chances are you've retained the muscle memory of good technique and that will help you tremendously -- it was the case for me and I considered that to be a boon. One less hurdle to cross.
Two things: try to get a good teacher who will respect what you do know, but will help you grow back into playing fluently. Second is something to consider: might you need a new guitar? When I finally realized I was committed to playing again, I got a new, smaller guitar that is immensely easier to play. Not an issue if you're comfortable with your current instrument.
And: you'll be able to revisit the old repertoire even better. I've just started back up on a Bach piece that I played ca 40 years ago. I'm using a different edition, and it's easier to play, but the musical understanding and appreciation is SO much better than before. Some of that's my teacher, some of that's just age-and-wisdom catching up.
Cheering you on, you can do it! And love the process.