A lot of how he played this year was a function of not having Kyrie. Usage rate obviously isn't a be-all-end-all stat, but this is how they've looked in these past few years...
2016
LeBron: Regular Season- 31.4%, Playoffs- 30.7%
Kyrie: Regular Season- 29.5%, Playoffs- 30.4%
Love: Regular Season- 23.4%, Playoffs- 22.5%
2017
LeBron: Regular Season- 30%, Playoffs- 31.6%
Kyrie: Regular Season- 30.8%, Playoffs- 31.1%
Love: Regular Season- 26.4%, Playoffs- 21.8%
2018
LeBron: Regular Season- 31.6%, Playoffs- 35%
Love: Regular Season- 25.1%, Playoffs- 24.3%
Hill: Regular Season- 15.4%, Playoffs- 14.6%
Bron and Kyrie were basically equal in usage when they were together and the offense ran significantly more smoothly. Defense has always been an issue for the Cavs, but at least the offense was clicking with those two leading the way. This year's team was completely reliant on LeBron orchestrating the entire offense, and them being able to knock down 3s, which simply didn't happen in the Finals this year. Pieces like JR/TT/Korver are definitely still there because of LeBron, and that has hurt the team. Would've been interested to see how a different GM would've handled some of those contracts, especially coming off a championship win.
He really just needs to be alongside another guard/wing creator that can take some of that load off of him and then have a better 3-8 supporting cast than he had this year, which shouldn't be too hard for him to find.