What style of deadlift do you do? Some vids would be useful too. Vids of bench too while we are at it to look for weak points to be addressed and strengths to be maximised
Maybe some detes on your powerlifting relevant training history because it sounds like you’d have a decent base of strength and muscle already.
So some things to consider would be getting bigger muscles that carryover to powerlifting, lots of technique practice working towards perfection and productive strength training:
Height is not a bad thing but at over 6 foot a lot of your weight would be bone. Muscle is the tissue that does the moving so having more within a given weight class can only be an advantage at least in the big prime movers for bench/deads like ur butt and pecs. Most guys your height would be more competitive in higher weight classes but that’s a long term growth thing.
September/October is a fair ways off so if you identify that building up more tissue in your pecs, triceps and delts for bench and glutes, hams, quads and back for deads would be an efficient way to improve then you have time to squeeze in a block or two or volume.
The split itself can resemble any classic bodybuilding/lifting split really. Like for myself right now it’s kinda full body but also push/pull with squat/bench alternating with deadlift/bench and accessories. It’ll depend on your needs. If your technique needs more practice than it’ll make more sense to have higher frequency for your target lift. There’s limits of course say going big on deads thrice a week will probably be too much for your recovery capacity. Many lifters use heavy days and light days to keep working/practicing while staying well recovered.
Anyways this stuff is kinda hard to sort out on your own but there’s plenty of existing programs that have taken these things into consideration so u train hard but still recover. That’s what I’d recommend: Select a program that looks good to you also considering your training history and recovery capacity.
Most likely you’ll end up tweaking it a bit to better suit yourself say if it’s too easy you can add more work in, substitute exercises or you can pick a full power one and not do most of the squatting for example.