Hey, I know this is a bit late, but thought I would jump in.
How to increase your website speed depends largely on the technologies you've used to build it. But my general rule has been, if I can send less stuff over the wire, whatever I'm building can be faster for people to use.
There's a lot of advice. Lighthouse audits in Chrome can go a long way toward helping you identify what needs improvement. If you need more specific advice, I'd recommend starting with Google's loading performance guide.
I hope this helps. I've subscribed to this thread and will get notifications of new replies. If you have questions, I'd be happy to field them when I can.