I have been mining with 1 GPU for about two months and it's profitable when I crunch the numbers, about a whopping $8 - $9 a month.

Best advice I can give you is think long term; it's a slow grind. Now's not the time to invest any money into it. I already had a gaming PC with a GTX 1060 6 Gig card that I barely use so it's just the cost of electricity for me. Find a coin you like and mine it; plan on holding it for several months or longer and hopefully the value will go up and you can make some $$$.