This last step is a synthesis of tips from Andrea Kuszewski's article, "You can increase your intelligence: 5 ways to maximize your cognitive potential" [54].

The majority of her tips can fall under the umbrella of "Do new things with your child", and more of a way to live life with your child.
The first tip of Kuszewski's that I think fits nicely under this topic is to be seeking novelty. When you try new things, it forces you and your child to create new connections in the brain, which build upon each other. This is like how dual n-back training works.
Also, you trigger dopamine when you try something new. This gives you an even bigger boost of motivation to try even more activities and encourages neurogenesis, which is the building of new neurons.
A few ideas are to learn a new instrument, ready history (I love the podcast Hardcore History), learn to cook new recipes or another activity you think you could do with your child.
You can even ask them what sort of things they are interested in, then dive down the rabbit hole of Wikipedia articles, books, and YouTube videos to help chase your child's interest while taking advantage of what learning new things does for our brains.
Something that tends to come naturally with trying new things, especially if it's physical, like chess, basketball, or art, is to always be challenging yourself and your child. If your child becomes good at something, and never works a little bit past their comfort zone in a challenging domain, then the benefits that come with learning start to stagnate.
The next tip from Kuszewski is to think creatively. This is often forced when doing new things, but can also be something you work into your every day practices. Fun board games force you to do this (My favorite is Telestrations).
Creative thinking forces you and your child to combine different thoughts to come up with new creative ones. This helps form new neural connections in the brain and helps your child perform better on other creative tasks, along with non-creative, more analytical tasks [55].
The last part I'm going to leave you with is something I hinted at, but when you attempt to learn new skills, always try to use Multimodal Learning. Multimodal Learning is when you use multiple sensory inputs to learn about something.
Let's take for example drawing. If you and your child decide that learning how to draw is something you'd both like to do, you could start with YouTube videos that show you how to draw a face, next work alongside a drawing book that has text along with pictures, then finally give it a shot yourself.
Bringing in these multiple are more effective than traditional, unimodal learning (think sitting in a classroom and being lectured to) [56].