Hey I wrote an article on my blog on how to activate lazy horses, if you may like to go and take a look!
Hey Emilia! Try to do a lot of transitions to get your horse more reactive! Using your voice can help you also!
good luck and never give up! 😊
Your horse must respond to your natural aids!
Squeeze with your calves....half halt....build up the energy
Have pressure on him while riding and practice using more leg. I have to practice that too so I feel you!