You adjust saddle height to get correct knee angle and fore-and-aft to get correct balance, After establishing that, you adjust bar reach and height. Use a mirror if you can, have someone take photos if you can't. Move your hands around and look at your angles. As fat as bar height goes, with hands on hoods and forearms horizontal you don't want your thighs hitting your stomach or lower ribs when pedaling You want some gap there, doesn't have to be much. Depending on your leg length and build, you may never even get close to touching your legs to torso. If that's the case, it'd be nice if you were low enough to make your back horizontal. Above these limits will be less aero and air drag is always present unless you're on a trainer. These limits may also produce the "correct" hip angle in your normal hoods position, so looking at this is a good thing to try. If you think you have a close guess about stem length and angle, stems are quite inexpensive online. Over the years, I've changed stem length and angle a few times and so have a few "spare" stems. I have a bike fit primer here: How can I fitting my bike

There's a website which shows the effect of changing stem length and angle here: Stem Comparison Tool | yojimg.net
If it won't come up for you, google it.

And there's also a bike fitting app for your phone: https://www.dcrainmaker.com/2013/10/...nt-review.html
This app might be just what you're looking for.