For five years, Alan P. Gross, an American aid worker, sat in a Cuba prison growing so despondent that he openly considered suicide.
Now Mr. Gross is contemplating a return visit to Cuba, and helping a new political action committee raise money to support elected officials and candidates promoting freer trade and travel to the island.
He will appear at a fund-raiser on May 4 in Miami at the home of his lawyer, Scott Gilbert, in support of New Cuba PAC, whose leaders said they hoped to capitalize on the détente between the United States and Cuba to push for broader access to the island for Americans.
Mr. Gross will lead an “off the record discussion on modernizing U.S.-Cuba policy” at the fund-raiser, which suggests contributions of $1,000 to $5,000.
Mr. Gross declined an interview, but he has emerged on Twitter as a loquacious commentator on United States-Cuban affairs. In February, he testified in Congress in support of restoring diplomatic relations and easing trade and travel restrictions as a step toward increasing the flow of information to Cuba.
Mr. Gilbert said Mr. Gross had “transcended the imprisonment he suffered for five years” and had promised since his release to “do what he could to promote a more constructive relationship” between the countries.