I cant play anything at all anymore: ranked, community, warzone.. i cant get in any of these. Do i need now more players in my fireteam to play? I mean i search mostly alone for a game and i only have few friends that play it.. so the most people i get are up to 2 me included.
You shouldn't require other players.
May I ask what region you're in and what time of day you're searching?
Also, what ranked playlists? And what do you mean by community? Do you mean the Customs Browser?
Im from germany and it was 17:30 when i tried to get into matchmaking and ranked but no playlist works. Every playlist tells me i need more people in my fireteam. Yes i meant custom sry^^*
Are you searching on the Expanded setting? If you're searching on the Focused setting it'll restrict you to the local data center (or local data centers). And the Balanced option may, or may not, prevent you from connecting to a US East data center, but it should open up other European data centers that the Focused option may prevent.
1730 (GMT1) seems as if it would be entering into a peak time period over there, so it suggests to me that the game's population (locally & perhaps regionally) is struggling fairly mightily.
Your best bet within the ranked playlists is often going to be the Slayer playlist. But you said you tried them all, right?
Depending on your skill-level and the available population the matchmaker may be struggling to put together a match that meets its bare minimum allowance regarding match odds. This is likely more prevalent within the ranked environment which often makes the social or warzone environments better options when pop is low.
If you don't mind playing the social arena environment you should be able to find people within any of the Fiesta playlists. They tend to be the most populated options within that particular environment.
The Customs Browser is going to be dependent on what's available. You could try loading up a Custom game yourself and then opening it up to the public so that others can find it within the Customs Browser.
Lastly, have you at least tried the Warzone Firefight modes? Usually people can find a game there as there's zero MMR influence within the matchmaking.