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 ^-^
You could always sell your in game bells on ACNL for tbt. I see people selling their tbt quite a lot, 100 is worth about 20mil (I think so at least, unless it's changed within the last couple of months).
Other than that, just make some detailed posts on the discussion sections. Good luck
