Loading problems

[PC]

Hello,
thanks first of all for the great theme!
I recently put my site online, but unfortunately I'm struggling with significant loading problems and have no further idea how to fix them. I've looked through the list of recommendations and followed everything, but still the site is getting very poor results. After all the work this is very frustrating - I think there should be a solution to this? When I do the speed test, I get recommendations on how to improve the page loading behaviour, but I can't solve them because I'm not a coder. I would be very happy if someone could take a look at this. The URL is: pandan.co
Many thanks in advance
Pia