Hi, Welcome to BC.
RAR encryption does not contain backdoors, so the only possible way to recover a lost password is to test all possible character combinations (Brute Force). There are many password-cracking tools available online, but none of these are supported by WinRAR, and they are used at your own risk.
Remember that if you lose your password, you will be unable to retrieve the encrypted files; not even the WinRAR author is able to extract encrypted files that have been password protected.
https://www.win-rar.com/password-recover.html?&L=0
Suggest keep going at it. (I have forgotten many myself)
There are crackers but they possibly will contain malware or you will see something like 5yrs remaining left...... Is not a good choice.