chrome bookmarks vanished

While trying to resolve numerous crashes and halts in windows 10, my chrome bookmarks were replaced by a partial set of two or five year old versions. Right before, my google voice login credentials vanished. When I finally was able to login to voice, my chrome bookmarks were replaced by a version several years old, losing years of adding and removing bookmarks. Perhaps a restore point restoration, which itself crashed twice, caused the loss of login credentials for google voice. Attempts to restore said bookmarks have so far been fruitless. Maybe a chrome bookmark management extension might be helpful, if anyone suggests a favorite.