Hallo Mario,
My boy loved LR from the start and only started losing interest after I built and was doing around 10 courses with him
I'm lucky to be a stay at home mom so my situation is different, but here is my story, maybe you can gain some new ideas from this.
Wilhelm never like Little Math and Little Music wasn't as bad but also not a favorite, so I use to do everything in the world to get him interested, icons, games, candy, you name it. What worked a little bit was doing the lessons while he was eating or drinking a bottle and the other thing that helped was having stuffed animals and other toys watch with us. I felt, he just had to watch because for me it was a lot of money I spent.
Then around his 2nd birthday, and that was the stage where I was also doing tons of Little Reader lessons, he started to completely refuse everything. So I quit for about a week. Then I thought to myself, why does he eat his veggies? Other kids have such issues with food a specially veggies. It was because I never dish up any veggies for him, only for me and my hubby, and because I don't care if he eats it or not. So here's the no-brainer, I started watching all the BrillKids stuff by myself, not caring if he wants to. We'll be playing and I say, hang on a sec, I'm just going to watch MY little musician, I'll be back, so soon enough he was right there wanting to jump on my lap, usually shouting, MY Little musician, not mommy's little musician (or whatever it was we're watching)
We're currently viewing about 12 lessons a day, including Chinese, Afrikaans, Biology, History, Chess, I built a course will ALL the animal stuff in the Little Reader library, lots of Shen Li's stuff, all kinds of stuff, and Little Math and Little Musician which he actually started enjoying this year and he asks for them first.
Your little one is still small, and the BrillKids programs really have a long lifetime, you could skip a year and still gain so much from it later on.
Good luck and all the best Mario