hello, I accidentally selected my main team to go to the battle cup and I can not get back to my old team, I realized that it was my mistake and I opened a new account to control the team that "lost" appears to have left the team and I can not come back.
is there any way to get back with the main account instead of just another one to control that team?
possibly reverse the situation?
Sorry, but it's not possible to re-join a league which you've previously resigned from. So you can't join that league with your main account again.
Now on creating a new account, you really need to read our OSM Terms which clearly states on point two that having more than one OSM account isn't allowed. So you'll have to delete that new account or you risk loosing both accounts.