Check Akari's tierlist in the sidebar, that will give you a good diea, on who to focus overall.

In your situation, you can play Vivienne as a tank at the moment. Focus on bringing 6 relatively good heroes to 9 * ,this could be Vivienne, Verthandi (at 9 * she tanks good), Loreley, Detlaff; these 4 are actually decent to great. For the other 2, you can choose basically who you want, BUT, you don't want to bring them higher as 9 * , as they will be sacrificed later on, you need 9 * fooder to get 10 * heroes.

The heroes you currently have aren't ideal to push very far except the 4 I just gave you; try to get a full 9* team with 2 more usable heroes (again, check Akari's tierlist), and then go from there.

You need to save a maximum of resources right now and do your weekly peaks, because the new hell and heaven heroes are about to get released, and that's a great chance for you to invest keys and miracle eyes to find your missing team members!

Stop leveling everything and focus on 1 hero

what I do now?