Hello there. At this point you want to stop trying to move forward in light and dark side missions. You should be looking to spend all your energy farming shards and gear for 5 of your light side and dark side toons. As for your level, you can raise that very easily by completing daily quests and spending energy rerunning quests for resources. For light side toons, I would recommend farming Hera, kanan, zeb,chopper and ezra bridger for your light side toons, and Tie fighter pilot, grand moff tarkin, boba fett, royal guard and talia for dark side initially. you will drop royal guard and talia soon enough when the light side toons mentioned get you emperor palpatine and thrawn, but they will allow you to make some dark side progress until then and both have use in later game(as well as being given freely to you at the start).
For the next few weeks try this. Click on one of your main toons. Click on a gear piece you do not have click find. Run the battle you need until you have the part. Move to next piece and repeat,