Learning to touch type takes time and practice. You weren't birthed being able to type 60-70 wpm with unorthodox form.
It'll take time to build up proper form; you'll probably start 30ish wpm, and if you spend time with proper form, you'll get back up to your old speed, and probably a little bit more. The second time you learn something, you usually do better.
I relearned touch typing in a high school keyboarding class, which was 5 days a week for not quite an hour. On some old school black and white macs, using ancient software etc. Put a file folder with one side under the keyboard, and the other side over your hands so you don't peak (fold at the back of the keyboard, in case that wasn't obvious :).
Practice and time. I haven't learned to touch type using some course or tutorial, and I there may be some out there that will get you up to speed even faster than learning it on your own.
I remember as a child not looking at the keyboard and thinking "I want to type the letter x", then using a finger and checking on the screen if I hit the right key.
Crude, finger-greased approach. As I said, there may be some guides on how to do it properly that, with practice and time, will lead to better results faster.
You shouldn't care about cranking out 100 wpm. You just want the text to flow without expending much mental and physical effort.
I am typing this final paragraph using hunt-peck style, while looking at the keyboard. It is horrible, feels like going back to the stone age with no electricity or plumbing. Can confirm 1000% touch typing is far superior.
It sounds like touch typing is reducing your speed because you don't know how to touch type.
Keep at it.
It takes a lot of time. Months at least. Sort of like learning a musical instrument. You'll hit a point where you slow down before you can speed up.
One mistake I made when learning to touch type was prioritizing speed over accuracy. Typing games made it worse. Try to get at least 98% accuracy first, and then you'll naturally learn speed. You learned to walk one step at a time, and need to master walking before learning to run.
Don't stress yourself out over it. That slows the learning. Just observe yourself typing. Observe your mistakes. Don't blame yourself when you do make a mistake.
Useful sites:
https://www.keybr.com/
https://colemak.academy/ (you can set it to QWERTY and then practice one part of the keyboard at a time)
These can be really boring sometimes and you'll hit a plateau, so feel free to just get Typing of the Dead to mix it up.