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There is a lot to discuss here.
First, sorry you are experiencing these difficulties. Sometimes life gets in the way. You need to listen to your body and do what you need to do to stay healthy.
Guitar is a journey, sometimes you will be able to consistently practice, sometimes you won’t. Don’t let it get you down. The key is to be somewhat consistent. Just picking up the guitar for 10 mins a day, or every other day, or whatever it is, is going to get you further than if you never picked it up. Every little bit helps.
The secret to TAC is to try your best at an exercise for at least 10 mins. Some you will play pretty good at that the end of the 10mins. Some you will struggle to get through the first measure. Both are OK. Some of the exercises are hard, but they will come back around and the next time you will get a little further. The motto is progress over perfection.
So don’t spend 3 weeks on an exercise trying to perfect it. Try it for 10 mins and then move on to the next. Try to find 10 mins a day to pick up the guitar. Perhaps before going outside and hurting your back. Having a tiny habit and small commitment works,