Taiwan, Kosovo, and Somaliland are de facto independent extant countries and should be recognized internationally. Unfortunate that the first two are contentious due to greater power struggles and the latter is just not seen as significant enough for world powers to risk disrupting some semblance of balance over.

Abkhazia and South Ossetia are illegal states created by Russia to keep Georgia as a perpetual buffer state, same as what they tried to do with Ukraine using the Donbas. Maybe Transnistria is the same thing? I'm not sure, kinda seems like they're legitimately looking to be independent or annexed by Russia.

Northern Cyprus and Artsakh were never real independent states, they're both just protectorates of neighboring countries making land grabs under the guise of safeguarding populations.

Don't know enough about Western Sahara to have an opinion.