You do realize that that Schwinn is a dream bike for a lot of folks here?

I would immediately convert it into either a full-on road/gravel bike (drop bars, brifters, fat wheels) or an urban commuter (same deal, slightly less fat wheels, with a flat bar) and ride the snot out of it.

@ BobbyG ; has it right. I'd put a flatter stem--or just lower that one if it dropped enough---and reposition the bars first. I might not need to spend a penny.

I periodically scan CraigsList for bikes just like that ... but usually they aren't in that good shape or for that reasonable a cost.