You need to change careers.
He is a big strong runner but not instinctive at all. He doesn't have the quicks to be a running back.
What people get caught up in is how he has scrambled as a QB. If you want to evaluate him at another position you need to compare him against other players at the same position.
Can he play RB? No.
FB? Well, he's 6'3" 240 so and runs a 4.71. He fits that profile the best. But can he play the position? Can he block? Who knows because he has never done it at the high school, college or pro level. Is it because of his measurables? Welp, do you have any idea how many thousands of guys with his exact measurables there are? MANY. Why aren't they NFL FBs? One reason is because they are becoming extinct. The other reason is because it takes more than measurables.
TE? Lol, do you know how long guys develop their skills to become a TE in the NFL? Can he catch? Can you run routes? Can he block? Who knows? Forget what he has done at QB in college. Take his side-by-side with other NFL TEs. That is where the comparison should begin. There are tons of developmental TEs with better measurables and experience floating around the league and free agency.
How about defense? pu-leeez...that ain't happening. He is 10 years too late to convert to LB. Any other position and you are putting him in coverage. Why in the world would anyone want to take that chance? Just draft a guy from a small college Jerry Jones style that has already played the position.
Tim Tebow is a situational/hybrid QB. That is what he will be. And probably not for long. Is there a slight chance that he could develop into another position? Sure there is. Right now he has the best chance that he ever has to develop. If his current coach can't make him productive then he never will. If he can find a niche somewhere as an option QB then he can stick for a while.
Personally I hope he does. He is a great person, inspirational, a great role model and everything you would want from a leader. If anyone can will themselves to be a good player it is him. I just don't buy it.