Here's something I posted on another thread - it might help a bit
"Well posting gets me a bit, but selling collectibles gets you real rich 8)
Well I wouldn't say I'm "real rich" but it's not too hard to sell some of your collectibles for a couple k.
I sold my flower wand for 4.5k a few days ago, and ended up giving my pink feather away for about $60's worth huehue
(I know that's not TBT but shh it's worth like 12k so I'm still kinda making a point...I'm just saying people really want noice collectibles for a lot of money 8|)
Anyway, buying collectibles from events (with tickets / eggs / etc) or just purchasing cheap and reselling for more is a good way.
Alternatively, you could make GFX **** (like ACNL sigs or something) or even sell some art. Mine isn't particularly talented, but I made about 300 per each headshot, which is pretty good.
Another way I don't normally do, is selling ACNL items (or if you find that too boring, anything from other websites / games (Pok?mon, Flight Raising, etc)).
I remember one dude had a rendering shop or something, so I mean, there's quite a bit you could do, even if you're not good at art or don't have many in game items.
I struggle sometimes (a lot of the time) but just posting long replies is the simplist and easiest way I think.
If you post 10 times a day, you could get a max of like 100TBT, so 700TBT a week. Obviously, it's hard to post super detailed replies that frequently, but even making like 10TBT a day adds up over time 8|"
I hope you find something that works! Good luck ^-^