Well, if you had any success at all, that's a good start! Once you know how the plant grows, and get better at optimizing its health, your yield will increase. I recommend you grow a few tomato plants again next year. If you want to try some of my seeds, when I make my giveaway post early next year, remind me that I promised to try to get some seeds to you in South America. I will do what I can. It's only a little extra cost, but the main issue is risk of the envelope being seized at the border, or by a naughty mail employee who thinks there is something valuable inside. If they are lost, no big deal, perhaps they will be grown by someone else who needs them, and I can try to send you a few more. It's possible :)
Have a nice weekend amiga.