How far are you in Commander DIB? I have a level and two chapters left. Unfortunately due to the stupid waiting system that's gonna take me a long time since I need to do a ton of grinding.
I finished the last chapter last week. Three stars on all the missions. Just leveling up my buildings and units while I wait for the next chapter to be released. They released chapter 9 less than a month after release so I imagine they'll release another one soon.
My advice is to focus on upgrading your money and ore buildings as much as possible, as well as base defenses, and the unit/starship buildings as much as possible when you can. Upgrading the money and ore buildings will obviously increase your collection rate, and make it easier to upgrade everything else.
Defense towers are helpful, as they'll go a long way fending off attacks from other players.
And of course, when you can, upgrade your unit buildings and launch pads, to increase the types of units available, the amount you can max out at (currently I'm maxed at 82 units, with most unit types between level 4-5).
Also, a tip. Use Chewbacca from your hero recruit building. He has a lot of health, and targets defense towers first when attacking. Use a couple medical droids with Chewbacca, as well as tanks and speeder bikes and a few Wookies to focus on turrets, and you should be able to beat all the missions with three stars if you send your troops out in the right way. 3-4 X-Wings (leveled to at least lvl 5) can also help clear out a lot of turrets before sending the ground troops in (I always start by sending 4 X-Wings and the ship they give you to attack turrets first, then I send in ground troops to mop up any remaining turrets and buildings.
Overall it's pretty easy, but I'm sure future chapters will get much harder. I'm just upgrading everything I can in the meantime. I have 3 droids for upgrading so can usually upgrade around 3 buildings per day (since most take a day or a little longer to upgrade now). My headquarters is level 6 (only one more to fully upgrade it I think), all my turrets are between lvl 4-5, my shields are all level 4, and everything else is level 4-6.
Also, another useful tip is to build as many of every building as possible based on your headquarters level. While the extra troop producing buildings may not be needed for building troops, they do increase your troop max and are pretty cheap at level 1. Same for the launch pads and resource producing buildings (since those will increase your resource intake rate).
And be smart with your walls.
I positioned my headquarters (the most important building, since if it's destroyed by other players or the AI in defensive missions you automatically lose) with three lvl 4 shields around it (which also protect all my turrets), my banks/ore storage buildings, and all 10 turrets I have inside my walls. All my walls are leveled up to lvl 3-4. Most attacks don't manage to take out my headquarters, and those that do are big money spenders who've rushed upgrades and unlocked the most powerful stuff.
Place your resource (gold and ore) buildings outside your walls--since anyone attacking will get those resources anyway, but I think what you've collected is preserved unless they destroy the banks/vaults. Also place all troop and starship buildings, launch pads, etc outside your walls and surrounding the base walls, since it doesn't matter if they get destroyed and can absorb damage while your turrets attack enemies.
That has worked pretty well for me.
