Get older tweets (more than 3200) per person

Hi guys, I am new with R and new on this platform. I already have a twitter developer account and got the latest 3200 tweets per person via the API (#packages rtweet; get_timeline). Now I would like to find out, how to get more than these 3200 tweets per person and older ones, since I need all tweets until 2007 for my PHD research project. Any ideas, how I could do this?

Thank you a lot!

You could use the academictwitteR package that uses the new API v2 and the Academic Research Product Track to retrieve more data,
Using rtweet you could activate the Full-archive environment and use it to retrieve more data (and older one).
Good luck with your PhD research!