Hello, I am wondering why a can’t bid on a item anymore?

[dreadtan]

Why all of a sudden can I not bid on items? 

[msau4301]

I'm not sure if any of these will apply in your case but some possible reasons could be:

You are bidding on an item and the seller doesn't ship to your location;

Could the seller have blocked you for some reason? Or do you have strikes against you for unpaid items or cancelled items? some sellers have buyers blocked with unpaid strikes against them.

Just a few possible reasons but if all is good on your end it could also be a temporary glitch (they do happen!)

[marnotom!]

Are you getting an error message when you try to bid or is something else happening (or not happening)?

As we don't have a lot of information to work with, it's not really possible to answer your question.  I can point you to an eBay "Help" page that might have the answer for you:

https://www.ebay.ca/help/buying/buying-limits-restrictions/buying-limits-restrictions?id=4012