You are doing well. You can and will thrive more than he will:
Yes rearrange , paint, and redecorate, get new bedding or houseplants to symbolise your good life with the DC.
Plan treats with friends and or the DC - cinema, restaurants, short breaks, overnight visits to friends who live elsewhere?
Rekindle old friendships, try a new hobby, sport or something similar. Knitting, art, gardening, Pilates, dance? Maybe a pet you always wanted?
Give yourself short-term and long-term goals such as travel, fitness or a course. Are there any local societies you can try?
You have the children behind you and can live your best life.
I’m 5 years on and met amazing new people in a book club and horticultural society, have caught up with friends all over the place. Have had holidays and birthday celebrations etc with the DC and friends. My ex seems fairly drab and directionless, living alone having split up with the OW once the initial phase wore off.