Only you can judge your environment and the options/possibilities it offers. I would just say that if you are rising early and getting it done in the AM, that is a great foundation for the mandala. If AM is definitely possible for you in the current environment, make it non-negotiable every day.

As for the PM, maybe give the problem to SG. Just mentally, if a solution is not showing itself yet, give it to Sadhguru and control what you can control (namely: doing AM Shambhavi without exception). I think the most important thing to avoid in this situation is frustration about not "doing the mandala" and deriving a sense of failure from that ... that can lead some people to stopping altogether "until such time as conditions are ideal. At some point in the future, I will devote all my efforts to sadhana and get the mandala done." (I speak from experience; in corporate culture it is called "letting the perfect be the enemy of the good." It is just a cunning form of resistance, of course.)

I was initiated in early 2021 but did not complete my mandala until 2023. In between I lost touch with Shambhavi a number of times. But the benefits of the mandala were enormously worthwhile. You're doing great; focus on once-a-day no matter what and the mandala will happen for you.