DT only starts by pushing, battery full

Hello together, I’m just getting my old DT 125 RE back in shape and now I have a problem at the start. She stood for 6-7 years and after I changed all the liquids, I tried to start it. It was clear that the battery was flat after the time so it was called push on. I then pushed her about 20 times with us a small hill and at some point she then jumped on. Uhh everything good! The following days I pushed her through again and again Now I changed the battery because it was 11 years old. The battery was fully charged. Now I tried to start it via the E-starter, but it doesn’t start. The starter turns, but it doesn’t work. If I roll it a bit and let the clutch come when the gear is in place, it is immediately on. What could that be? I would have the idea now that the engine has too little compression and the starter does not manage to start it. I wouldn’t think of anything else right now. It just doesn’t matter that she’s drunk because of too much fuel, but he’s supposed to be gone when he gets started and then it should work.