Like you, we bought a house to do up and then had to move due to A new job.
The house was basically sound but quite dated decor. So we
painted everywhere in neutral tones ( we painted over the existing wallpaper )
replaced the dated patterned carpet in the hall / living / kitchen / dining with a light wood laminate ( this was the most expensive thing we did )
Put our Extra sofa and large living room unit into storage, along with all our boxes of book and other stuff and most of the Crap from the bedrooms. This made these rooms look twice the size.
Bought a nice rug for living room, cushions for slightly dated sofa And throw and cushions for bedrooms ( took them with us of course ).
We borrowed some more cushions and stylish lamps and pictures from an obliging family member who has more money and better taste
Got rid of all family photos , kids pictures and ornaments. Totally depersonalised the house. This part felt quite sad actually but helped us ‘ move on’ .
Bought cheap Ikea neutral coloured curtains for living room and bedrooms instead of the weird floral ones and Venetian blinds we inherited With the house
Replaced single ceiling light in living room with a new one with more bulbs. Made the room much brighter.
Changed dated taps in bathroom, Used a grout pen and painted the non tiled part of wall and ceiling. Replaced the light wth a brighter one.
We “styled” everywhere to within an inch of its life.
We were gobsmacked at how much better it all looked and Wished we had done some of it sooner , so we got the benefit ourselves. But we kept saying “ there’s no point as we will be ripping out the kitchen / bathroom next year “.
Basically all the bedrooms, living room and hall were totally transformed. Really bright and much bigger.
Even the dated kitchen and bathroom looked better with better lighting and painted and clutter removed. Of course nothing could disguise dated fittings but The rooms looked much bigger.
I think we spent about £1.5- 1.8 k, mostly on the new flooring and storage. I’m not counting cost of the accessories as we took them all with us, and we borrowed some. We did all the painting and new lighting ourselves.
We got about £20-25 k more for the house and it sold very quickly, we had lots of viewings and several Good offers.