If you want to work in America in 2019, you should be planning to apply for H1B Visa in 2018 petition with USCIS.
Probably the most logical way to find a sponsor is to apply for a job at a company that sponsors H1B Visas. If you are an international candidates in USA than you must have to find Jobs in us with visa sponsorship.
Find List of H1B Sponsoring Companies Here :
H1B sponsoring companies