Windows 10 lets me select normal, large, and extra large, but even the largest setting looks quite small on a small high-resolution display.
Is there a tool that could help make the mouse pointer even bigger?
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There are several options, besides increasing size, to improve visibility of the mouse pointer. My favorite is to make it 'inverted' so that it is white while on a dark background and black while on a light background. See this link for details on how to do it.
You can also show mouse trails, which help to see where the mouse is when it is moving; instructions available at this link.
You can have a blinking circle appear around the mouse when you hold down the Ctrl key; instructions available at this link.
If you really want a custom cursor Stardock's CursorFX does a great job. CursorFX has a number of built-in cursors, animated cursors, sound effects for your mouse clicks and lets you create your own cursors. There are also thousands of pre-made cursors for CursorFX available at WinCustomize.
If you just want a basic really large cursor you can try the xxl cursors available at rw-designer.