I've been looking for a Linux alternative ever since I mostly switched away from Windows a few years ago, and so far this one is the best FOSS alternative I found: https://doublecmd.sourceforge.io/ - it's even written in Pascal, same as TC.
MC is great for the terminal, but I'm more of a GUI guy - Total Commander has introduced some improvements over the original Norton Commander (e.g. showing file icons, right-click context menus etc.) which I don't want to miss anymore...