Let's start with the feeding. Hay is more important than the pellets. 80% or more of the diet should be hay. Pellets should be the plain kind (no colorful bits) and it should be a measured amount only. A 5-7 lb rabbit should be offered no more than 1/4 cup of pellets daily. It is quite common for rabbits to prefer pellets over hay. That is why the pellets should be limited.
For a list of good pellets, check here
. The greens (think more in terms of greens -- herbs, dark lettuces -- rather than 'veggies') should be introduced gradually. Each new type should be introduced by itself so that you can check bunny's tolerance.
Fruits are unnecessary. They can be offered in small amounts as a treat, however. The general guide is no more than 1 tbsp worth of fruit per day.
You can find bowls that twist onto a clamp that attaches to the cage. These can't be tipped. They can also be used for water.
I'd suggest replacing the corner litter box with a larger rectangular box. The larger the box, the more likely bunny will use it for what it should be used for. It isn't unusual for bunnies to lie in their litter box. If the litter is topped with hay, bunny is more likely to hop in there, munch on hay and use the box to potty.
Some rabbits will play with 'toys' while others ignore them. However, the topic of toys ties into the topic of bunny proofing. If you haven't been able to bunny proof yet, then an exercise pen can be quite handy. You can make a semi-circle with an x -pen that goes around the current cage. That provides more space for bunny in an area that is still "safe." Some items you can use for entertainment are a cardboard box with windows and doors cut out. Seagrass mats, wicker balls, and even open paper bags can all provide chewing pleasure.