since; ever since
Attaches to a noun or time expression to mark the starting point of a continuing state or action. Often used in formal or written contexts.
I haven't seen him since last month.
I haven't returned to my hometown since graduation.
ever since; from that time on
Used adverbially or as a noun to refer to the entire period after a past event. Often appears as それ以来 or あれ以来.
He had an accident and has been hospitalized ever since.
I haven't heard from her since then.
I haven't seen him since last summer.
Ever since that incident, the town's atmosphere has changed.
Ever since I joined this company, my days have been busy.
から is the everyday, spoken way to say 'since/from', while 以来 is more formal and stresses a continuing state up to now.
昨年来 fixes the starting point at last year, whereas 以来 is a general word for 'since' that needs a time word attached (例：卒業以来).
以来 attaches to a point in time and means 'since then', whereas ぶり attaches to a length of time and means 'for the first time in that span', so 三年ぶり focuses on the gap while 三年前以来 focuses on the starting point.
以前 means 'before' a point in time, the direct opposite of 以来's 'since/after' that point.
以来 means 'since' a starting point and implies continuation up to now, while 以前 points to time before a reference point; learners often mix up the two because both attach after a time expression.