If you find yourself on a performance-improvement plan, you need to be thinking about your next steps. Even if you complete the plan, your best next step is probably not in your current job.
Occasionally, you could be put on a PIP for reasons less in your control. Perhaps you had personal issues that caused a performance problem. Or your manager was unable or unwilling to support you as you struggled in your role. This is an unfortunate situation that happens all too often. For those very few who manage to work their way up and out of a PIP, this chance for renewal is lacking. They return to their current role having escaped a near-death experience. Both they and their manager are cautious and look for every sign that would indicate further struggles.
So turn your attention elsewhere. Somewhere where you can gain a fresh start and a more positive outcome. It will be better for your attitude and outlook. Find new positions where you feel confident you can perform and apply for those.