Ways of farming SG:
Putting AC scratch clothes on all your chars, it basically works out to 10 SG per char, per day, so for the 3, free chars you get that’s 30 a day.
Titles give a ton of SG, just go through the list and see what you can earn here are some of the best ones. S ranking Story missions on hardcore, getting each class to lvl 80, earning the bonus SP for each class, taking a 13* weap for each class to +35, and lookbook likes.
PvP gets you 100SG a week, and a bonus depending on where you finish each month
Casino gets you 40SG a week, for 11,700 coins, this sounds like a lot but get 4 players on mesta shooter on silver, and you can earn this in about an hour.
Running the weekly TA Runs, if you finish high enough you get SG for both solo and group times
You get 60SG a month just for logging in
You get around 40SG every PSO2 day
Theirs always random campaigns going on that give SG makes sure you meet all the requirements for those
If your premium you get 200SG a month from mission pass, and another 60SG from login stamps, and extra SG on the premium exclusive PSO2 on the 22nd.