Odieman has some good suggestions.
Examining enemies and having counterspell is essential. My main is a lorebard, she has countersong, which is an automatic reaction, if enemies try to charm someone in the group, very useful. You get to s of potions, grenades spells rolls - use them, don't hoard them, like we rpgler like to do. There are plenty more to come.
Use high ground and give enemies difficult terrain to slow them down and use crowd control spells like Hypnotic Pattern or the Glyph spell.
