PC Master Race

Hey PCMR, what’s a good upgrade path for my old PC from 2018? My budget is about $500 USD, here are the specs:

CPU: i3-8100
Mobo: B360
GPU: 1060 6GB
RAM: 16 GB 2400 MHz DDR4
Monitor: Asus 60 Hz 24", VZ249HE I think
PSU: Seasonic S12II 520w

Use case: gaming, streaming, minor video editing, work

I don't mind getting secondhand, might actually prefer it depending on the part. Also kinda wish I won't have to change mobos unless the performance difference is big enough for the same price (like 10+ FPS). I'm thinking I'll just get an i7-8700 + 6700 XT + 650w brand new PSU and I'll follow that up with a monitor upgrade a month or two after this upgrade. Though someone here might know a more optimal route?

Also, any monitor recommendations? Would it be better to go with a 1080p 24" 144 Hz or 27" 1440p 75 Hz? I don't play a lot of FPS but I do go sim racing

Thanks guys