It's possible that BL's actions directly after killing GP tell us a lot about what his actions are now.
If you take the tiktok sightings as true, then he was seen parking at Spread Creek dispersed site on 8/26 at 8:10PM. If he left GP's body across the creek from there that night, then it's possible he walked along that creek bed west/northwest towards the Snake River. I can only imagine his mind would have been going a million miles an hour at this point and physically, he was on an adrenaline high. Getting away from people would have been paramount and following the creek to the river area would have been an easy way to do that unseen.
What he told the Coulter Bay tiktoker, who picked him up there on 8/29 at 5:30PM, is that he had been camping along the Snake River for multiple days. Well, this makes perfect sense if he walked from the dispersed site at Spread Creek! While he was on this multiday campout is when he must have formulated his plan. And that plan included returning to pick up the van at the Spread Creek site and drive back to Florida.
Question is, what is in Florida? It seems obvious - his parents. His parents, and/or what he had at that house, must have been instrumental in his plans. He had to have known the **** would hit the fan soon but he knew he had plenty of time to come up with his escape plan which he is executing now.
My guess is that what he is doing now is exactly what he did between the time he killed GP and the time he surfaced in Coulter Bay - namely backpacking and resurfacing to eat/shower/hitchhike. If he's not dead in that swamp they are searching, then he will surface soon and be easily spotted. His options and resources seem very, very limited.