Which will turn it into a good reflected XSS.
You find a self XSS in a POST request
Check if it’s directly vulnerable to CSRF, Using the CSRF you can make a user submit the POST request using your preset parameters including the malicious payload. Which can initiate the XSS (You can test this using ZAP Anti-CSRF Test Form).
You find a self XSS stored in your account in a website but can’t affect but the user of your account.
Check if that website is vulnerable to login/logout CSRF, you can induce a user to logout then login to your account and get affected by the XSS you stored there.
Always go all the way in trying to turn self XSS to Good XSS and try to follow how other hackers do it you will be amazed how often it happens.