As it is clear GetOldTweets3 is a python library for accessing old tweets which is not easily feasible with libraries like Tweepy. But recently, there is an unsolved issue with it due to the new Twitter API: https://github.com/Mottl/GetOldTweets3/issues/98.
The question is what is GetOldTweets3 alternative library for retrieving tweets without time constraints? In my experience, Tweepy can not retrieve more than 200 tweets.
The 200 tweet limit is a per request maximum. You can retrieve successive "pages" of tweets by using the returned
nextparameter to request the next page of 200. If you are using the Standard Search API, these requests will stop return tweets older than about a week. With Premium Search API full-archive you can get all tweets going back to 2006.It is explained in detail here: https://developer.twitter.com/en/docs/twitter-api/v1/tweets/search/api-reference