Your shared folders are listed in the Library window. Right-click & choose share folder for the folders you wish to totally share again. Else unshare then share again.

Ultrapeer status; make sure U.P. is not disabled in your LW Tools -> Options -> Advanced -> Performance.

I am unaware of a technique to 'force' U.P. in LW 4.18. The process usually depends upon what the surrounding area of the network needs at the time. If there are sufficient ultrapeers then it may take much longer to become one. Perhaps you could disable U.P., press apply. Then enable it again.

Whilst U.P. might be great for downloading, if your LW is too busy then that may affect it becoming an ultrapeer.