is there any way to tighten the tention in the small belt attached to the y motor

[matc94 0]

I believe my belt is slipping on my y motor and it is causing it to shift my print mid print. I've only printed 3 things and they were each fairly small printing in about 2 hours but lately been trying to print something that takes just over 3 hours and it shifts near the end every time I also tried a different model with a long time as well and ran into the same problem. when trying to figure out what was going on I felt the tension in all the belts and that belt was rather lose I loosened the motor and lowered it as much as possible and got the same issue any advice.

[Labern 737]

did the belt actually tighten? You need to press down really hard as you tighten the motor screws.

You can also check all the screws in the pulleys, They need to be super tight.