Wait. Be patient. That's all you can do if you are a long term investor. Just don't look at the market for now if you cannot take it.
This will happen eventually and it's always just a question of "when?". We didn't know. No one knows. There might be those analysts that made the right prediction but those are guesses which doesn't have 100 percent accuracy.
The other thing you could do is buy more for a cheaper price then be patient again.
If you're long term then it would really be understandable that you do need to wait and patience would really be tested on times like these and it's not surprising that market could really move sideways whether going up next or would really dip down further that's why it's really hard.
When you do have the experience then you do have the advantage over or compared to those people who are just new to deal with the market. So expect the unexpected because everything could really happen along the way.