Please help me find a good mid-range graphic card for Adobe Premiere Pro and plugins

To be honest, there are five i9 CPUs that were available in the Precision 5820, ranging from 10 cores and 20 threads (i9-10900X) to 18 cores and 36 threads (i9-10980XE). This alone makes it very difficult for us to recommend a GPU under these circumstances. However, these systems were only PCIe 3.0 compliant on the main x16 slot. Therefore, you want to avoid a low-end GPU that utilizes fewer than the full x16 bandwidth (for example, the Radeon RX 7600 and the GeForce RTX 4060, both of which use only eight PCIe 4.0 lanes in their slot connection), which will become bottlenecked by low interface throughput (remember, GPUs that use only eight PCIe 4.0 lanes, and especially those that use only four PCIe 4.0 lanes such as a Radeon RX 6500 XT, absolutely require a motherboard that's fully PCIe 4.0 compliant just to avoid seriously degraded performance). Thus, your PC is in a very tough spot for any GPU upgrade that's cost effective: You'd either suffer from a PCIe interface-induced bottleneck or spend too much money on a new GPU for relatively little performance benefit (compared with your current GPU).

That said, with that system I'd get a GeForce RTX 4070 SUPER (if you can find one for about $600-ish), or wait until the RTX 5070 ships and is available before you upgrade the GPU. Everything else that's more expensive than a 70-tier Nvidia GPU will only be throwing money at the CPU bottleneck problem. But don't go with a 60-tier or lower GPU because the older PCIe interface standard that's used in your system will bottleneck the GPU's performance.

https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html

Moved discussion to hardware forum.