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At the end of the Large Hadron Collider's Run 2, CERN's Linac 2, commissioned in 1978, delivered its final beam. For Run 3 a new machine will take over the role: Linac 4. The machine has been producing test beams since 2013 and in 2016 it reached its design energy. Since then several improvements have been made which enhanced the LLRF performance and stability. In this paper the structure of the machine and the control system are presented. Problems arising from different RF station types are described and our solutions explained, along with new features recently added to the LLRF. Performance of the recently implemented Linear-Quadratic Regulator with Kalman Predictor is compared against the performance of the previously used Proportional-Integral controller. An Adaptive Feed Forward implemented as a flexible hybrid hardware-software solution is described, and first results and conclusions of this application are presented. Addition of the set point modulation needed for longitudinal phase-space painting is discussed. Expected benefits from all of the above systems working together are explained. Finally, software tools for automation of setting up, monitoring and operations are described. As the hardware and low-level software are still reaching maturity, are only briefly introduced here.