I would highly recommend Wizzair. New 320/321s, no overnight stays - always sleep at home. Avg of 14 flying days a month (+ some avlb, stby). Several bases close to Czech, as well as decent commuting options via the network.
You should be able to upgrade within 2 years, provided you show the right qualities.
If you decided to wait for an upgrade, then work another 1500hrs as CPT - how will the situation be in Europe by then? Will anyone hires pilots? There is a chance you will be "forced" to stay in the USA for another 2-5 years. Are you happy with that?
I agree with you and "what next". The USA is amazing for a holiday, but personally, I couldnīt live there. Out of information you provided - I would move to Europe asap, while there are openings. My everyday life is a lot more important to me than work or money. You can find a lot of great companies in Europe nowadays and get it all. Stay in Europe, work for a good company, upgrade to a CPT in 2 years and well above avg money for living.