Your agent told you to sign up for an improv class. You did improv in college or high school. You’re broke and really don’t want to do another class.
The Pack Theater is also hot right now. This school was founded by Miles Stroth, who was a teacher for iO Chicago and West. It’s been growing like wild fire and is very fun to watch and be a part of the community. I’d recommend getting in there now if you can.
iO west is the bomb. Go here if you want to strengthen your improv and acting chops.
Groundlings also still has a name, but you’ll learn more short form and characters.
I’ve heard good things about Second City as well. I know a lot of good teachers who perform at other theaters are there. You can also audition for “the Boats” after you finish their conservatory program. (“The Boats” is performing on cruises.)
If you want to take a lot of improv classes but don’t have the money, contact the school and find out if they have an internship program and apply.
Please be respectful and don’t call yourself an improvisor after only taking level 1 that one time 2 years ago.
Don’t be a little brat and have a fit if you don’t get on a Harold team after your first audition. It takes a lot of time (usually) before anyone is placed on a team at any theater.
Improv is an improvised scene study. You will gain very similar tools that are taught in scene study classes. I know. I’ve been in both traditional acting classes and improv and they say the same dang thing. Improv will strengthen your acting skills as well as your “life” skills (like being yourself when you walk in a room; dealing with high pressure performances; saying “Hi” to a stranger). Don’t shortchange improv. Explore and heighten.