I'm an electrician, and have been involved in various flipping projects, there are two types of flippers - those who understand you need to invest cash in the property and do a good quality refurbishment to add value and mage a healthy return.
The second type, the OP is clearly in that category think that spending little, doing a bit of painting and DIY refurbing will add huge value.
Buyers can see right through that, and simply view the property as needing a full upgrade, the painted kitchen and garage door are still old, no value has been added - new bathroom fixtures well installed make sense, but a poor or partial installation with low quality fittings will just be seen as needing replacement.
So here, no value has been added, and a core selling point, a mature garden has been removed - DIY painting of the exterior is just going to be a complete nightmare to reverse requiring hours of labour and material.