Sick of 5x5

First time poster here...

Just to give you an idea of where I'm at - I'd say I'm an intermediate (maybe advanced? I dunno) lifter. Bodyweight about 95kg. 1RM's of about - 230kg deadlift, 120kg bench press, 170kg squat, 80kg military press.

Basically, I've become kinda sick of 5x5 training. I've been doing it, more or less none stop (with rest days and de-loads, obviously), for a few years now. I want to try something new. The problem is that I'm scared that if I start doing lighter weights with higher rep ranges, then I'll lose the ability to lift the weights that I can now. I want to start doing some stuff in the 8-15 rep range, without losing my strength. How do I do it?

Does anyone have any advice, or a programme they'd recommend?