Geezer, I'm sorry to hear you're losing your instructor. You are training in Wing Chun and Kali, correct? Is this your Wing Chun or Kali instructor leaving? If it's the Wing Chun instructor, I'm sure you're at a very proficient level that you could run your own group. If you have all the forms, and applications and concepts to the forms, there is no reason you can't continue to learn and advance in Wing Chun by constant practice.
Something I find is a lot of times the instructor is not pushed to their limits. You push and physically test your students all the time, but no one pushes you. As an instructor, you need someone at your same level to give you some difficulty and test your skills. You can still get students not at your same skill level to do that. They won't be as good, but, it is still the oportuninty for you to learn something. It's the constant practice in one form or another that helps to build the skill. Be it using concepts from the Biu Jee form, to the long pole and butterfly sword. Junior students can feed you drills to help improve your pole and blade skills. You just have to give them the direction to help them give you what you need to train it.
My sifu is at such a high level (and seems to improve all the time), I asked him one time, where does he find people to test him, people at his level to teach him. And he told me that he never stops training, and touches hands with everyone he can. The more you do it the better and easier it gets. That's the secret. Sometimes he spends hours working one set on the dummy, just playing with it, over, and over, and over, tearing it apart, putting it together, looking at from all angles. And he does that with everything. Yes, he does teach full time, it is his profession (that probably helps more than anything, it allows him to spend hours each day if he wants), but still, it's the constant repetition of doing forms, working on the dummy, long pole and butterfly sword drills, applying and doing things over and over, that has brought him to such a high level.
My sifu only spent 7 years with his sifu, with a lot of time doing chi sau. But that was enough to give him the basics of what he needed so he could take the art and run with it. He pressure tested the art, used it against other art forms, and crosstrained to see how he could make it work against everything he could find. He's always telling me and my fellow students 'there are no secrets to mastering Wing Chun, you just have to put in the time and diligence and work at it'. And he's right.
What you have to do is decide how far you want to go. Are you happy with what your skill level is right now? Or do you want to take it even higher? You have to make sacrifices somewhere to do it. More quality time training to get results may mean less time with the family and friends. If you're only training 2 days a week, maybe you should train 3 to help improve. If you want to take your chi sau skills to another level, maybe you need to add 2 days more training to your regime and train only chi sau on thos days. Same with the long pole, blades, and dummy. But you have to make the sacrifice to do it. Nothing comes easy, but if you have the basics (all the forms, drills for chi sau, dummy, pole, butterfly sword, etc.) all you need to do is constantly work them. If you want a master's skill level, you have to put a master's length of time doing it. That is the secret.
The truth is only you can determine how high your skill level becomes. If you want it, YOU have to be willing to take it (the art) and do something with it.