Changed GEO targeting, all rankings dropped - when can we expect to come back? Hreflang settings

Hello,

We have two websites for two languages. Domain.com for english and cs.domain.com for Czech.

We at first set the cs.domain targeting to Czech, in search console and domain.com left unlisted (international).

This however made an error, that Google gave English search terms rankings (which the English site is optimized for) to our cs. domain in Czech SERP.

Now this obviously is not what we wanted as if user has an English query lets say apples and is in google.cz (czech google) they should get English version even in Czech local SERP and same for the Czech (get cs.domain.com).

We then removed targeting for both (Hoping then Google will serve either the main domain or cs.domain.com according to the query languages)

Question 1: We lost all rankings in all serps, when might we expect them to come back?
Question 2: Is it now correct, even if user is in Czech but googles english term gets the domain.com and if Czech term gets cs.domain.com

Our href lang tags are as follows:


<link rel="alternate" hreflang="cs" href="https://cs.example.com/"/>
<link rel="alternate" hreflang="en" href="https://example.com"/>

Should we add the country codes then to Englishlike this

<link rel="alternate" hreflang="en-CZ" href="https://example.com"/> < for English queries in Czech Serp
<link rel="alternate" hreflang="en" href="https://example.com"/> < for international
<link rel="alternate" hreflang="cs-CZ" href="https://cs.example.com/"/> for Czech queries ?