If you're well off financially and can afford to pay for a deposit box, then get one and store your seed phrase. Also, leave a note of your bitcoin investment for your lawyer to disclose to your family in the event of your passing. If you don't have the financial capacity to rent a deposit box, then you've to trust a family member close to you with your seed phrase. If you fail to do this and you kick the bucket, your bitcoin will be lost forever, except someone accidentally stumbles on your seed phrase.

Entrust it to someone whom you love and whom you trust. You know if realizing that we're all just passersby in this world and nothing is permanent, you've got to enjoy your money before unforeseen events happen. Set some price targets when you're going to sell and do the things that you love. In case that you're foreseeing that your day is about to pass and you'll leave this world, leave it as an inheritance so that your family and kids will enjoy your hardwork.