What can I do to increase page loading speed on mobile devices?

Hi there, I need some advice. I have been working on this website (link removed by moderator) for the last 2-3 days. I just did a speed test, the loading speed is very low on mobile devices. So I have decided to do AMP to make the pages load quickly. Does it solve the problem?
Is there anything else I can do to improve the page speed on mobile? It would be great if you can help me with some valuable suggestions. Thank you.