Changing the doors is not as easy as it sounds and depends on whether you have standard sizes still available and most importantly hinges that line up. We did change doors on a previous kitchen and had new worktops put in. We had to redrill for hinge holes in the carcass. One of the screws lined up but the other did not.
The easier option is to paint. I am reserved about Frenchic just because they never allow anyone to leave a negative review. If people could do that then it could just well be user error and they could be told how to fix the issue. Instead I would clean them, lightly sand, Zinsser BIN primer then paint. Just try one door or one drawer front first, don't do the whole kitchen, see how that first one goes.
Depending on how long term your saving goal is and your budget I would look at the cost of replacing or shortening the worktop above the fridge, remove the cabinet above (although I cannot tell if it is one large cabinet with double doors or not) and put in a taller fridge or fridge freezer there. Any joiner would be able to reduce that double cabinet down to a single or if you are good at diy you could attempt it. After all this is just a temporary measure.
If you know how kitchens are installed then it makes it easier to tackle removing a cupboard, and yes, we did exactly what I suggested, removed an upper cabinet for the same fridge reason. The best tool ever for DIY is the multi-tool with different blades for cutting through screws that have lost their heads or nails. www.screwfix.com/p/mac-allister-msmt300qc-300w-electric-multi-tool-220-240v/617gf like this.
I should say that I do install my own bathrooms, tile floors/walls so maybe I over estimate ability or experience in others. Flooring wise, LVT (luxury vinyl tile, well plank) is a great and easy DIY option for kitchen floors. Clicks together like laminate but is vinyl and waterproof.
Lots of helpful videos on YouTube to cover all sorts of these things.