Applied at globally recognized agency for Creative Director

I've been unemployed for almost three months now and I'm currently weighing a job offer from a globally recognized agency for the role of Creative Director. I have over a decade of experience in the field, but my previous job ended on a sour note when they admitted to overpaying me and asked me to continue at a significantly lower salary of ₹15 LPA. My last salary was ₹25 LPA, so this has been quite a hit to my finances and confidence. The new agency wants to hire me at ₹20 LPA, which is still a ₹10 LPA cut from my last position. On top of that, I would need to relocate to a different city, which means additional living expenses. I've had a tough time during my job search, as I've cleared skill rounds in multiple interviews but was often rejected due to salary expectations. This is the first serious offer I've received, and I'm torn about whether to accept it. I understand that taking a pay cut might seem unwise, but I also recognize the potential long-term benefits of working for a prestigious brand. Before I make a decision, I'm planning to negotiate a joining bonus, a relocation allowance, clear designation, and a clause for a salary review after six months. I'm reaching out to see if anyone has experienced something similar. 1. In hindsight, was taking a step back in salary for a well-known brand worth it? 2. What else should I consider negotiating before signing? 3. For those in the advertising or creative industry, does working for a big network genuinely open doors, or is it overrated? I would greatly appreciate any insights, especially from those in advertising or anyone who has taken a pay cut for a better opportunity.