Yeh, I have some low end tektro mech disk brakes on my mountain bike, I’ve managed to get them working very effectively, I have no idea about your model but…
it’s any help for future, I tend to:
Screw the static pad right back so its out of the way
Loosen the bracket on the outside caliper/pad
Insert a train ticket or similar between outer pad and disk
Hold the caliper/pad on but quite lightly against the disk
Tighten back up
Wind static pad back inboard until it prevents wheel from spinning freely
Back it off a tiny bit until wheel spins acceptably
This works well for me, I get a tiny tiny bit of rub, but great bite.
If you have excess leaver pull after that then maybe pull a bit more cable through at the calipers, they should then bite a lot more enthusiastically.
One thing to note it cable systems do not self adjust like hydraulic systems, so as the pads wear, yyo may need to fettle them as needed.