I'm glad you got it running. The Thermaltake SMART is not very good PSU and one you'd have to swap out for major upgrades, but that original PSU was absolutely frightening.
Your hardware fits together well, it's a suitable GPU for a PC of this age. But yes, you would need a major upgrade to get modern performance; you basically have a budget gaming PC from a decade ago, so there are some real limitations to take into account. And that major upgrade would basically be everything at this point since, again, it's a PC full of 2012-2013 parts.
If you're happy with your machine, just enjoy it!