Images on page are no longer clickable and enlarging. Mobile nav bar doesnt work

Hi. I am having a couple of issues with my website! I know that my template is outdated and so is the version of WordPress. But it is so that it is compatible w it. I fixed any hosting issues already. But now the issues I am having are the following:

The images on my page are taking too long to load. I did not have this issue before. Also on each of the post pages, the images are no longer clickable so that you can few a larger image. It gets blocked. It only works if it is linked to something. I want to be able to click on all the images I have so you can see it enlarged. What can I do for that?

the other issue I am having is that on the mobile version of my page, the navigation bar is no longer working. It used to work. When you click on the navigation links, it says that the page is not found. I am not sure how to fix this? Do I need to create a separate one for mobile? It works just fine on desktop.

thank you!

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