RE:Oil service sector... I agree with you.
Admittedly, I once owned Akita Drilling and Total Energy Services before the oil crash in 2014. Don't ask me how I did :)
If I recall correctly, Akita was debt free back then and Total Energy was my high return on equity play that never truly materialized for me. Looking back, I learned a valuable lesson and how it's all about timing in these cyclical companies. It's not about time "in" the market but about knowing when to enter and when to exit.