Don't worry about the Last Jedi title because the first line out of Luke's mouth is going to be, "Rey, we're getting the band back together!"
The first person Luke recruits from hiding is Jedi Master Max Rebo and his Jumpin' Jedi Jizzers, the elite Sentinels of the New Jedi Order. Next up is their Battle Mistress Sy Snootles with her Hootle Caboodles (the reappearance of space owls from Rebels and TCW). Finally the Wookiee Jam Crew.
First they're going to hold an epic benefit concert to raise credits to restore the New Republic, then they're going to get their Jedi Rocks off, do some lines of midi-chlorians, and finally they'll be taking their show on the road to Snoke's home town for the Battle of the Bands. The Knights of Ren are just posers anyway playing cover songs from the far superior Knights in Sheev's Service. Those dudes at least had a real army.