"About" is a preposition, and prepositions don't have suffixes. They are complete words that indicate relationships between other words in a sentence.
If you're looking for a way to express "about" in a different form, you could consider using:
* -ly: Adding "-ly" to some words related to "about" can create adverbs, like "approximately" or "roughly".
* -ing: You could use the gerund form of a related verb, like "concerning" or "regarding".
* -wise: This can create adverbs like "timewise" or "costwise", which can sometimes be used to imply "about".
However, these are not direct suffixes for "about" itself.