[grosmont50]

i thinned out my beetroot a week ago and its not doing well , is there any thing i can do to help them//

[DD.]

Make sure they're moist enough & leave them to recover.

I never thin mine as such, I let them push each other to one side and start harvesting at golf ball size.

[Springlands]

You need to keep them well watered after thinning out. A liquid feed solution might help,  or some Blood, Fish and Bone meal lightly forked into the ground around the beets although that is slower to work.

This has been such a cool and at times dry season in some places that some crops are being slow to grow.