By next year?!?!? You could prepare for a Marathon in that time
Thats what I normally do for my RFL buildup. I'm TF, 39, 178cm, 90kg and run a 9:20-10:30 RFL depending on its importance

I start training about 4 weeks out depending on my current level of fitness (usually around the 11:30-12min mark) every 2nd day. I like to do at least 2 weeks of intervals and then finish off with 2 practice RFLs at pace before the actual date.
To be honest I only bother with the 6x400m in sub 1m40s to get me prepared these days but a lot depends on how hard you are willing to push yourself during trainings.
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