Ugh the doors. I agree, would love to change ours, including a few wardrobe doors, we would have 16 door to replace though! We changed all the light fittings and handles pretty much the first thing we did when we moved in in early 2000's, the house is early 1990's.
Other things we did immediately, a new kitchen, and ripped out all the pelmets, in every, bloody, room! Also removed decorative paper borders, from every, bloody, room! Removed a revolting brick fireplace, and replaced all the carpets, for a mix of wooden flooring downstairs, and new carpets upstairs. Then lived with everything else for 18 years.
We have recently just upgraded our bathroom, and en-suite. OP, I think you need to gut. We went for it. We had peachy tiles, white panelled fully fitted cupboards, a spa bath. It all needed to go. We took out a wardrobe to get extra space in the bathroom, and replaced everything. We also replaced the water tank and boiler. What a difference. They are now modern, warm, efficient, and we use less hot water and heating.
Our next job is to replace the old conservatory roof with new updated panels, better for heat and warmth, and glare.
After that...... not sure what needs doing next. We still have sliding mirror doors in the two spare rooms, I would love to get rid of those too.
Always so much to do. (We were very lucky we didn't have artex - thankful for small mercies).