Honestly, I have been thinking about alternatives to LastPass for some time. KeePass is a logical choice, but the only thing that's holding me back so far is the fact that I want to use LastPass on multiple platforms. I still have to explore reliable options to do this with a KeePass password manager.
KeePassXC for all desktop OS (LIN,MAC,win), KeePassDX for AndroidOS, there are extensions for Firefox and Chrome browsers, and you just need to remember (and backup) one master password.
KeePass allows importing of CSV files import (export it from LastPass); than you can keep KeePass database locally on all your devices, use your own server for hosting, or some cloud for that (less secure).
Simple, secure and easy to use.
For all other open source alternatives you can check here:
https://alternativeto.net/software/lastpass/?license=opensourceI think that is why I do not use a password manager. I keep my password in the safest place on earth(My mind). Though I do use an external device to keep my password safe in case I forget them which usually does not happens.
If your mind is your safest place than you are just a time ticking bomb waiting to explode, and it's impossible to remember hundreds of passwords, but maybe you are using one more revolutionary (bad) thing - one password for all websites