Hey,

Well, you can definitely pursue architecture course after graduation if that is what you wish to do in future. Also you can get into Project Management as well but I suggest you should work hard in your own stream assuming you have not lost your interest in the field. Don't ever fall into false claims by anyone that such and such field is very good or you can make more money in a particular branch. Your passion must drive you. There are many engineers who go for MBA and excel in that field as well while some stick to their streams and do M.TECH instead. Many civil engineers grab government jobs as well and there are some who prefer becoming IT professionals rather than willing to go to "construction sites"!

So what I would suggest is follow your passion, choose a field in which you are most comfortable working.

Hope it Helps!

Best Wishes