There is no central location to donate to open source software in general. Most open source projects include donation details on their website or in their code repositories.

I feel like I do nothing but plug liberapay these days, but it really is great and it’s how I do what you’re trying to do. Because of the processing fees payment networks charge, it’s usually more realistic to do yearly rather than monthly donations if the amount is small, but it’s otherwise exactly what it sounds like you want

Is there anywhere I can set up a monthly donation so I can at least help support the people who do have those skills?

Yes, many places. They are usually listed under the "donate" section of what ever project you want to support.

Here are a few:

https://organicmaps.app/donate

https://www.freecad.org/sponsor.php

https://inkscape.org/support-us/donate

https://donate.kicad.org/

I asked this same question not long ago!

Find small projects you like and donate. Their dev sites usually have a donate option.

Look at something you use daily,  Go to their github and donate there. Preferably to a project that needs more funding.