Well in my case I had a similar issues almost a year ago and this is where I also decided to work on additional GBs that can provide me Forge Points; for instance, here are the stats of my city's Great Buildings (as of May 3rd):
Arctic Orangery Lvl 68 (68 FPs)
Cape Canaveral Lvl 72 (72 FPs)
Castel del Monte Lvl 75 (45 FPs)
Hagia Sophia Lvl Lvl 73 (43 FPs)
Innovation Tower Lvl 75 (45 FPs)
The Kraken Lvl 60 (48 FPs)
So I get 321 Forge Points from my GBs every 24 hours...yes, this represents a big investment and will take some time but, for a lot of stuff in the game, you have to be patient and invest the time and effort needed before your city snowballs and you can reap the fruits of your efforts
Emberguard also brings a good point: if you can successfully attack AND snipe some of your Neighbors, then you can get your hands on some additional FPs on a daily basis.
Finally, I cannot recommend enough to invest on a Chateau Frontenac; on a regular basis you will get your hands on 5 FPs Packs...and with the Recurring Quests you can get additional Bonus Rewards which you can then use to complete other Recurring Quests and, therefore, increasing your chance of getting additional 5 FPs Packs (I get about 15-20 extra FPs a day just from those Packs!)
As of now, I am also investing time and FPs on my Blue Galaxy and, as of today, I usually 2X once or twice FPs collections of my Buildings that produce the most FPs (20% chance every day on average is quite good!)