1-Hotel California- Eagles: This song made me think outside the box more. I was amazed by the different techniques that were used and how it all came together in a great way. When I got to learn it I appreciated the techniques more than when I was just listening to it. The solo influenced my playing out of everything I’ve heard.
2-44 Minutes- Megadeth: I was still a beginner and my guitar teacher had given me the song’s intro to learn. I listened to the whole song and it made me realize that shredding can be incorporated really well to create a beautiful melody.
3- Don’t Stop Me Now- Queen: This is one of the first solos I ever heard and it it’s one of my all time favorite solos. It was also the song that introduced me to the band but it also got me to listen to solos by other bands and made me want to explore as many different genres as I could listen to.
4- Afterlife- A7X: My first A7X song. I still remember walking up to my brother and my cousin and they had it playing at full volume. When the solo came I was just mesmerized. It got me hooked and made me want to become a shredder. The amount of skill in that solo alone inspired me to get an electric guitar.
5-The Trooper- Iron Maiden: The song that introduced me to metal. I loved the power throughout the whole song, especially the solo. The bends, hammer ons and pull offs made it a very interesting solo to listen to.
Like Dominik said, maybe the reason you’re getting bored is because you’ve already reached the goals you set in the different part of the routine (but in terms of the improvisation maybe you actually did get bored of pracricing over the same backing track/ chords every time). And maybe this routine has nothing to offer that interests you anymore. Especially if you have other commitments. You can always practice them every once in a while to give yourself a refresher, but if you have other priorities at the moment then you should definitely follow those first.