For your information:
If you, for whatever reason, have been blocked from a site, you can create a new destination (change identity) without restarting.
In Java i2p, there is an option to do this after some inactivity (and maybe also some other way)
In i2pd, all ephemeral destinations are regenerated after you click reload config (if i remember correctly)
Restarting the whole router is not very good.