This is why you need multiple trees, to cover all the options.
My main tree/house decorations changed from several years of black/silver & blues to blush/pinks and golds last year. I will be sticking with this this year.
I have my classic greens and reds one that the dc decorate with a grinch theme too. All the fun decs go on this.
Then each dc has there own bedroom ones, as I have all girls there are lots of pinks/purples/silvers, lots of frozen themed decs and princesses. We put all the school/nursery made decs on these usually too.
DH has his Star Wars themed one, which to be fair I love prob more than him.
I have a Harry Potter themed tree too.
I also have a food themed one, gingerbread people, cupcakes, ice creams, mini kitchen utensils etc which goes in the kitchen.
I like to collect decorations from around the world and places we visit. They tend to go on the trees they match the most at the time, but I’m hoping once my collection gets bigger to have a specific travel themed tree eventually.