​Conor McGregor remains hopeful for another UFC comeback.McGregor (22-7 MMA, 10-5 UFC) blew out his right knee in the first round of this past Saturday’s UFC 329 main event rematch against Max Holloway (28-9 MMA, 24-9 UFC) at T-Mobile Arena in Las Vegas. “The Notorious” injured his knee on the first kick he threw and struggled to stay upright before the referee waved the fight off just 69 seconds in.AdvertisementAdvertisementAdvertisementMcGregor took to Instagram to promote his MAC Energy drink Tuesday on his 38th birthday. In the caption, McGregor thanks everyone for birthday wishes and writes “38, no hate! Just love!”In the video, which also features wife Dee Devlin, McGregor declares, “We’ll be back” before doing the sign of the cross. “In the name of the Father, the Son, and the Holy Spirit. Amen, let’s go.”