My Southampton save has been very similar to yours in terms of the number and the spread of trophies won, but I have to hand it to you - you won the Europa League and the Premier League a couple of seasons earlier than I did!
I got to the semis of the Champions League last season and have won my group this time around, knocking out Barcelona in the process. I'm a bit more restrained in the transfer market and in season 2020/21, I still have Clyne, Shaw, Lovren, Schneiderlin, Ward-Prowse and Rodriguez, with Lallana still hanging around as an unregistered over-ager in the U21s. I also bought Ross Barkley, but now I can't give him away, and Guido Vadala has joined me from Barcelona for this season.
Stadium capacity has just been increased to 42,790 and the training ground and facilities are being improved at the moment, so hopefully I'll be able to shape my squad around the products of the youth academy, with the occasional worldy from overseas.
Good luck with the rest of your save - race you to the Champions League title!
Did you see Dominic Fifield's article in The Guardian last week, about Calum Chambers and the Southampton Youth Academy?
http://www.theguardian.com/football/2014/apr/17/calum-chambers-southampton-interview