Brief ex-Jodel DR221 owner here with a few hour on type (before it toasted itself - you know the one!)
I found I had exactly the same problem as 122.45.
All the advice above assumes a servicable aircraft!
Please, check your brakes. When was the last time they were done and what was done?
Also brake symmetry. Test can be done pref. on tarmac, at no more than a safe fast walking pace, by pulling the handbrake. Does she pull evenly or pull to one side?
I never got the hang of crossy landings in the Jodel due to it's destruction so I apologise for the lack of further advice. I will say however that this year's foray into Maules, despite it's reputation for groundloops, exposes better handling than the Jodel.
BR