There are multiple posts in /r/IPTVresellers looking for new Vader resellers. These are new threads since it was announced that Vader has shut down. And I've seen at least one of those people posting here looking to be altruistic (/s) and give previous Vader subscribers a new home. All i'm going to say is watch yourselves when searching for a new provider.
Most people that have been around IPTV long enough will know to stay away from something like this, but newer people...be careful and do your due diligence when trying to find a new service.
I don't have any advice on a new service to check out and i'm not going to name any. Check /r/IPTVreviews and even then, read everything and not just what the OP of a review has to say.