Thanks.
Do you mean the hyperlinks that are within your content, like on this page: https://www.paloaltoenergy.org/todays-energy-outlook/
Or the menu links within your header, and footer?
You could try installing and activating this custom CSS plugin which allows you to easily add CSS code to your theme.
Once the plugin is activated, go to the Appearance > Custom CSS admin menu and paste this code in the field provided:
a { font-weight: 700; }
This will increase the font-weight of all links on your website.
Let me know if you want to target specific hyperlinks and I’ll modify the code to suit.
Hope this helps.