I already had the .conf file. Any other sugestions?
Yep, sure!
Try bootstrap
https://github.com/signatumd/releases/blob/master/bootstrapFirst, backup your entire wallet folder to another folder to be sure, so you have something to get back to. Next you can download the bootstrap and follow the instrucitons.
It have helped me when I have had redownloaded SIGT wallet and also have problems with sync.