Bike feeling odd

Hey everyone.

My bike is 18.4k done and 5th service is yet to do. And got to know that my chain is weak as the service guys told me like a month ago.He tightened it. For 10 days the vibration is too hight after that it reduced.So as no long ride planned I thought of changing it in my next service.like jan 18th or something. But lately I noticed My bike is feeling sluggish, slightly vibration increased at foot pegs, handle bar. It lost its smoothness like it used to be. After proper warmup only the exhaust sound is the one. But now some buzz from front side.

And my suspension, omg it became too hard .it throwing the bike even for small bumps . I can't feel any smoothness it's very hard. And bike doesn't feel planted at high speeds. Breaking is average asusual

Help pls