My laptop does not support ultrawide monitor?
This is a physical limitation of the HDMI video port as detailed here: https://www.dell.com/support/manuals/en-hr/vostro-15-3500-laptop/vostro_3500_setup_specs/ports-and-connectors?guid=guid-da941dbf-7209-45b3-a380-f529efb39077&lang=en-us
However, I also note that it comes with an optional USB C port and USB 3.2 port which provides plenty of opportunity to purchase an external dock or video adapter with capabilities that will work with your monitor.