Was my upgrade worth it?

I recently upgraded my computer.

Previous build was AMD FX8320, 24GB RAM and a GTX960 without going into detail. Did have an awful ASUS motherboard, did stand the test of time for 9 years though.

New to me now is a small form factor DELL Vostro 3470 with an i5 9400, 20GB RAM and a RX6400

Now reading online, it seems that my latest computer still isn’t enough to keep up. It seems to play my games ok but am I missing out? Is it really obsolete? All I really play is some TF2, Destiny 2, Beam NG Drive etc

Also what should I do with the completely out of date FX build? Any ideas 🙋‍♂️