Social media.... record everything like training videos, sparring rounds competitions and matches but show it all (the highs and the lows).

also look at getting a sponsor to help promote you

Yep. Honestly more important than competition results. I know of someone whose not as accomplished as a lot of people in my country, but he's got a large enough fan base to be asked to do a BJJ Fanatics Instructional. It's a popularity contest more than anything else.