The good news is that a lot of the ways to make your website more accessible are really easy - they simply involve not filling it full of fancy-pants ways to recreate basic native browser functionality (ie, crap).
Yes, content accessibility can sometimes need additional thought and work - for example, avoiding reliance on colour or images - but function accessibility is more often than not available through standard HTML. It’s when webbists try to show off or use frameworks that they don’t understand that it really starts to go pear-shaped.