Take a look at the actual pixel count. It is going to be blurry if your rendering is 800x600 and your printing it to fit on an 8.5 x11 sheet. dpi doesnt matter if your scaling the image.
Determine the size of the final print you want in inches, multiply those inches by the dpi you want - typically 300 or 150 (72 for anything just seen on a computer presentation) - and the resulting number is the pixel count you want to set your rendering at.
1200dpi is unneccesary, 150 actually works well for a large format print seen from the street.
So if you want the final print to be 24" x 36"
- 300dpi would be 7200 pixels by 10800 pixels
- 150dpi would be 3600 pixels by 5400 pixels
JPG is OK, but I prefer PNG or PDF
AC 6-27 - Intel i9-9900K - RTX3090 - Windows 11 - 64GB RAM