How to meet the MTBF objective?

I assume that MTBF means the mean time between failures.

I'm not an expert in maintenance, however, I will answer considering the MTBF as an indicator that we want to improve by increasing the mean time between failures. Thus, I would apply the classic quality tools. I would start with a Pareto chart with the reasons for failure. Then, for the most frequent reasons, I would perform a cause analysis using, for example, the cause-effect diagram to determine the root causes. Then I would develop actions to eliminate those root causes.

I recommend consulting the following materials:

• How to use quality control tools to improve your QMS https://advisera.com/9001academy/blog/2017/04/18/how-to-use-quality-control-tools-to-improve-your-qms/
• Free webinar - Measurement, Analysis, and Improvement According to ISO 9001:2015 https://advisera.com/9001academy/webinar/measurement-analysis-and-improvement-according-to-iso-9001-2015-free-webinar-on-demand/