85 XJ700 Mystery Starter Issues

Hello all, I am new here and hoping somebody can help me out. I'm a new motorcycle owner and rider and bought an '85 xj700 maxim a few months ago. I've been having problems with the starter/electrical systems from the beginning, replaced the battery and voltage regulator so far but an issue still remains where I can turn the bike on and lights will come on, but when I go to press the starter all I hear is a 'click' coming from the general area of the battery as well as the oil light coming on when I press the button, though I think that happens to matter what. So far the only solution I've been able to come up with is bump starting it which is no easy task on a 700cc bike, so I'm hoping to fix this issue and be able to reliably start it! This issue is not constant, it does start normally sometimes, the issue does not seem to begin under any noticeable conditions and I am stumped on what to do. I'm guessing it's something electrical, maybe starter or alternator? Hoping someone may have also had this issue and will know what I can do to fix it, happy there is a forum dedicated to this specific bike model!