I did a bunch of research and decided for the least hassle in terms of fungicide, miticide, and insecticide, the Bayer 3-in-1 would be effective, both for treating current problems and providing preventative measures. You might need to do some research on how to apply it to sundews though
I used them probably one week after I got my two starter flytraps, It's been about 10 days since I sprayed them, no issues!
https://www.amazon.com/Bayer-Advanced-Disease-Control-32-Ounce/dp/B000WEMIS6/
Is the placement against the wall permanent or just for the photo?
In an open space, preferably on grass, lay the pot down on its side. Some soil may fall out, but that won't be a problem. With the tree on its side, hose down the all the leaves with a strong spray of water. Let it drip for a few minutes.
Move to a different location, preferably on grass, lay the pot down flat on the other side and hose down again. Let it drip.
You will likely loose leaves, but hosing it down should get a good deal of the pests off.
Next, I strongly suggest re-potting the tree in fresh soil. Water thoroughly.
After it's re-potted, watered and upright, use an all purpose insecticide, fungicide, miticide, such as one of these that targets insects, mites and fungi.
Move to a shady location for the next step.
Saturate the leaves completely, making sure to get all the nooks and crannies and underneath as well as on top.
Keep her out of the sun for about a week.
Check DAILY for any sign of disease, insects, mites, etc... REMOVE any infected or damaged leaves and spray with a 3 in 1 (as linked above) as needed.
BioAdvanced 701287A Miticide Pesticide Fungicide 3-in-1 Insect, Disease and Mite Control, 32 oz, Ready-to-Spray https://www.amazon.com/dp/B000WEMIS6/ref=cm_sw_r_cp_api_i_hEv1DbKY8R3VW
Here ya go. Its available on Amazon! Good luck!