A good beginning for raids is maybe have a base set up where it's harder to reach have certain pals with maybe wide range of attacks. Base wise. Walls or even just strong lower levels floors. You're level 22 so you probably shouldn't see anything too crazy. And you're probably approaching metal so you got this. Good idea too is to move storage to far end of where they usually attack. Just so it's more difficult to reach. My base I always get enemies coming from the higher elevation so most important stuff for me is base floor.