How to cope with guilt, shame, fear, sadness, remorse for not executing a certain idea before someone else did it and made it commonplace?

As software engineer and entrepreneur, how to cope with guilt, shame, fear, sadness, remorse for not executing a certain idea before someone else did it and made it commonplace?
I lose executive functioning as a result.

Here are some strategies that many entrepreneurs and software engineers have found helpful when grappling with feelings of guilt, shame, regret, or fear over missed opportunities.

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1. Practice Self-Compassion

• Acknowledge Your Humanity: Everyone makes mistakes or misses opportunities. Recognize that you're doing your best in an ever-evolving environment.
• Reframe Your Inner Dialogue: Instead of harsh self-criticism ("I should have done that sooner!"), try saying, "I did what I could with the information and resources I had at the time."

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2. Embrace a Growth Mindset

• See Setbacks as Learning Opportunities: Every entrepreneur faces failures and missed chances. Focus on what you can learn from the experience.
• Separate Idea from Execution: In the startup world, having an idea isn’t everything. Execution, timing, and market dynamics are critical. A missed opportunity can be a stepping stone to refining your strategy.

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3. Reframe Your Perspective

• Shift from “What if” to “What now”: Dwelling on missed opportunities can paralyze your executive functioning. Instead, ask yourself what actionable steps you can take today.
• Prioritize Future Ideas: Focus on the possibilities ahead rather than what could have been. Maintain an idea journal to capture and iterate on new concepts.

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4. Implement Structured Routines and Tools

• Create Small, Manageable Goals: When executive functioning feels compromised, breaking tasks into smaller, achievable steps can help re-establish momentum.
• Use Planning Tools: Leverage task management apps, calendars, or even physical planners to keep organized. This can help reduce overwhelm and improve executive functioning.
• Mindfulness Techniques: Practices like meditation or breathing exercises can help calm your mind, making it easier to regain focus and clarity.

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5. Seek Professional and Peer Support

• Talk to a Mental Health Professional: If these feelings severely impact your daily functioning, consider reaching out to a therapist or counselor who can help you work through these emotions in a structured and supportive way.
• Connect with Peers and Mentors: Sometimes talking through your regrets with fellow entrepreneurs can provide perspective, reassurance, and even new ideas on how to move forward.

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6. Develop Resilience Strategies

• Practice Reflection: Journaling your thoughts can be a powerful way to understand your emotions. Reflect on what happened, how you can learn from it, and what you want to do moving forward.
• Celebrate Small Wins: Recognize and celebrate progress, even if it's not directly related to the missed opportunity. These small victories can boost your confidence and help restore your executive function.

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7. Establish a Forward-Focused Mindset

• Set a New Vision: Identify what excites you about your field and realign your efforts toward new projects or innovations.
• Continuous Improvement: Regularly review both successes and setbacks. This iterative approach can transform regrets into strategic insights, fueling continuous growth.

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Remember:
Every entrepreneur faces moments of self-doubt and missed opportunities. The key is not to let those moments define you but to use them as catalysts for growth and innovation. If these feelings continue to impair your ability to function in daily life, consider professional support to help you navigate these challenges more effectively.

Take it one step at a time. You've built your skills as a software engineer and entrepreneur by learning and adapting over time—and this experience, painful as it may seem now, is part of that valuable journey.