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Decided to make a few changes, work out more, stay off most social media and not responding to bs texts from a girl that has friend zoned me. Mostly making myself scarce as possible. My question is this, is it a good sign or bad sign if she texts me: "Are you still alive?"

It is a good sign. It means that she misses you.
You are doing the right thing building up an attractive lifestyle. It will make you look less in needy and more interesting.
I am not sure about the social media tactic. Facebook can be a good way to project that you are a social person if used correctly. I for example use facebook to arrange going out with my friends. It is easier putting everyone on a single chat window. I also never forget to post photos of me going out clubbing or weekends abroad sightseeing. Nothing bad with social media if used in the right way and don't take over your life.
While you are away doing your thing, it is a good thing that there is something online so this girl can look up and create in her mind the image that you want.
Scarce is good but you need to leave a reminder of you behind you. Facebook is good for that. She will browse your photos and your statuses.
Also when you don't want to answer if you were somewhere you can post your photos on facebook and when she is wondering she will go and see that you were out having fun.
There used to be out some good PUA material on how to project your sexuality in a more natural way. I don't know if there is more improved material. I think the guys here and point you into the right direction.
Oh! and something else... don't focus on this girl that has friendzoned you. Flirt, talk to people around you.