Law is not a game of play that it can be tuned to one's desire time and again.
If you had executed an affidavit on oath before court and a verdict has been drawn based on your statement by the court, then you are bound by it.
The law is common for all.
You have to look for some loop holes to derive some share of income from that property now being enjoyed by your brothers alone.
You my file a partition suit claiming partition and also share in the mesne profits stating that the affidvit what was given during that time was on the oral assurance to share the revenue whereas practically it is not happening.
Your advocate in the local may be having more such ideas, you may contact one and file a suit immediately.
Please remember that once a judgment has been passed based on your affidavit expressing no objection, then if ther was no appeal against it, then it becomes final and any application at this stage to nullify the earlier statement is not maintainable.