New things list of stuff I tried, from tiny and easy to more challenging:
walk a local street you've not been down before
listen to a band on you tube you've not heard before
go to a new cafe
order a drink you've never had before
cook a new recipe
buy a fruit you've never had before (physallis, starfruit. jackfruit etc)
and a veg (prickly cucumber, romanesco, weird wild mushrooms)
take DC to a new park
ride a new form of transport (e.g. tandem, steam train, rickshaw, open top bus, speedboat, unicycle, skateboard)
read a book in a day
watch a foreign film with no subtitles and work out what it's about
have a beauty treatment you've never had e.g. get your eyebrows threaded/mani/pedi/facial/hair colouring
climb a tree (I loved doing that)
build a den/snowfort/massive sandcastle/bonfire with DC
draw with pavement chalk
make mocktails, lemonade or smoothies with DC
design a new cocktail
write a poem (don't need to show it to anyone)
hold/cuddle a kind of animal you've never touched before
go birdwatching (if you start feeding birds in your own garden, you get loads of rare ones)
plant some seeds
make a cushion
upholster or paint a piece of furniture
make jewellery
write an app
do a free online course
walk barefoot outside
hike somewhere new
do a day trip somewhere new
book a holiday somewhere new
learn a new language (not necessarily fluently, just enough to order food and get directions on holiday)
apply for a new job or a grant
enter a competition
volunteer for something
talk to a stranger
dance in the kitchen
sing in the shower
do a sudoku
write to the newspapers
visit an unusual museum like Dennis Severs candlelit house or the underground postal train
go to a live gig of a kind of music you never normally listen to
You can also look at online bucket lists. You start to get a feel for what works best for you. I realised I'm quite adventurous with food, music, books, art etc so all of that was no big deal. But so self-conscious that singing in the shower even when no one else was in the house made me cringe. I found it really hard to do but felt weirdly brave and cheered up by doing it. Same with dancing in the kitchen, talking to a stranger etc. All the slightly extravert things were hard but they all helped me feel happier and more confident. And overcoming tech- phobia led me to get a new job.
Also, by the end of the year, I was just more motivated and managed to get us off on holiday to more interesting places than usual. And I visited places I'd wanted to visit for decades but never got round to. It just eases you back into enjoying life again.