Two solutions:
-You have the seeds. Then you don't really need us and you wouldn't post here as you're not new I guess.
-You don't have the seeds, then only bruteforce will work (from what I know).
For bruteforce the important part will be "how much do your remember". Approximative passwords? Length? Some characters? Vague idea?
It can goes really quick for example if you know that the password is "something like alex89/" but if you don't have much data it will be nearly impossible.
Sorry then because I lost 0.3BTC like this so I feel you --'
I only have the backups in the my keystore file. So no seed :p.
I contacted wallet recovery services and seeing if they can help me out.
Well then I suppose you can say goodbye to your money ^^'
If I remember correctly no good wallet would let you get back your funds without the seeds!