I need a little help with my build

In addition to the video card, you can overlock the 2600 processor to the speed of 2600x. Your motherboard with the B450 chipset will allow you to do this without any problems. The difference between these processors is small, so you did the right thing by choosing the cheaper 2600.

https://nanoreview.net/en/cpu-compare/amd-ryzen-5-2600x-vs-amd-ryzen-5-2600

As for the video card, I recommend the RX 570, but be careful when buying out of hand.

Thanks but i already have the rest of the parts i really just need the graphics card thanks for the reccomendation

Hands down the best value "budget" GPU around these days is the RX 470/570 (same
exact card with slightly higher clocks on the 570). Used you can pick them up
cheap. Anything less is not worth the money so I would do whatever you can to
squeeze one into your budget. I picked up a brand new "mining edition" (single
display output) RX 470 for $100, used they can be as low as $30 on ebay etc.