Try searches at BNC, here for and so on (no quotation marks are necessary) when in doubt:
--------- In Partnership areas, a committee was created consisting of representatives of local and central government, the health authorities, the police, voluntary groups, and so on, chaired by a cen
The reason for using an etcetera is to inform your reader that there are other examples besides the ones you've listed for them. Therefore, it's redundant to use "etc" in the sentence you provided because your list was preceded by "too many things like" (itself a clunky use of phrasing), which informs your audience that what follows is not exhaustive. In this case, you'd choose one g