You could buy more feathers.
Once you mutate your Nascient Indrick to Dawnwood Indrik, your Nascient Indrick becomes unlocked leaving you free to re counjure it and have both Indricks at the same time.

You can buy more feathers, for the purpose of starting another nascent indrik, but be aware that you can't start that second indrik even with a second full set of 4 feathers, until you have evolved the first indrik with 4 berries. This may help you decide whether or not to get the additional feathers.

Also, there may or may not be other things to do with tickets other than indrik-related, but ZOS has made no such commitment or indication thus far. The thing is that it might take the better part of a half year's worth of events or more to get enough tickets for the feathers and berries for each morphed indrik, so it's possible that they may not do anything else with the tickets for another 2-3 years or more, waiting for everybody to get the 4 evolved indriks plus a 5th nascent....hmmmm....

New Life Festival -> finite. Now only w8 on information about next event and way to get new items for ornamentation Indrik !