Alternate Sources of Raid Character Shards

The problem with being in a guild by yourself is that you cannot generate enough raid tickets alone, nor complete territory wars and battles. Additionally, i could be wrong, but I'd guess that if you don't have han solo at 7 star yet, you probably can't solo the tank raid. The tank raid's rewards aren't as good as the sith temple raid, which is far harder. You have cut yourself off from a huge source of gear and other materials. Even if you just join and don't contribute, provided the guild finishes the raid, you will be getting far better rewards in a week than you'll otherwise get in, possibly months.