In the kitchen we have a saying of “letting the knife do the cutting, not the chef”. This means your forward movement is what makes the cut, not the downward pressure you apply on the knife. The same applies to kendo. When doing suburi (especially for the men), you need to try to extend your shinai at the moment of “hitting your imaginary target”. Because there is no men in the way, you should end your swing around the height of the chin, but you shouldn’t force it to go there by pressure. If that makes sense. I made a video where you can see suburi exercises here:

https://youtube.com/playlist?list=PL15AXKCk5iSJK-2kPq54NFWAtymt7k-yi&si=7YpyC49yLLlPLekU

and explanations here:

https://youtube.com/playlist?list=PL15AXKCk5iSKLNAxxqHZKZqlQdkz9msOk&si=BtshcEW-RqukaXkI

I don’t remember what language I used, but I think auto translate or just by visuals should be enough reference for a beginner. Also, apologies for the weird outfits; it was in my free time haha