Definitely shouldn't take 4 weeks, especially with NVMe if you're talking about WD SN550. My synchronization took a day with my HDD and 6 hours on my SATA SSD but they had 6GB of dbcache. Is your ISP throttling your connection by any chance?
Sorry you are correct WD SN550 not Samsung. I have a gigabit Fiber to the home connection and my sync speed jumps like crazy when I manually add nodes so I don't think they are throttling.