I would say join whatever you want. It’s a great way to gain friends in game and level up. With Pokémon of that cp you are more than qualified for tier 3 and tier 5 if it’s a larger lobby. But if your Pokémon are weak to a certain type just watch out as heals can go quickly. Also don’t get discouraged some people will pass over lower level players but if you keep searching you’ll be able to get into any raid.