- I strive, to get success to me.
- The old man with a beer bottle ran, to learn to run without spilling.
- An apple fell, to adhere to gravity.
If commas don’t work can you recommend what I should use instead. I want to make it clear that the 2nd to (used as a preposition) is only referring to the infinitive and not anything left of the comma.
This is not a standard use of a comma.
The basic uses of a comma include
separating parallel elements of a series:
red, white, and blue
Marge, my mother’s sister, was late
but do not ordinarily include dividing a single phrase.
In your three examples, the infinitive is a complement of the main verb and thus wouldn’t be separated by a comma.